Whey Proteinℹ Whey protein is a mixture of globular proteins isolated from whey, the liquid material created as a by-product of cheese production. Whey protein is commonly marketed as a dietary supplement, and various health claims have been attributed to it in the alternative medicine community. Although whey proteins are responsible for some milk allergies, the major allergens in milk are the caseins. The use of whey protein as a source of amino acids and its effect on reducing the risks of diseases such as heart disease, cancer and diabetes. Whey is an abundant source of branched-chain amino acids (BCAAs), which are used to stimulate protein synthesis. When leucine is ingested in high amounts, such as with whey protein supplementation, there is greater stimulation of protein synthesis, which may speed recovery and adaptation to stress on muscles (exercise). Whey has approximately three grams of leucine per serving and the threshold for optimal protein synthesis is three grams.
Protein Isolateℹ A whey protein isolate (often whey isolate) is a dietary supplement and food ingredient created by separating components from milk. Whey is a by-product of the cheese-making process. Whey can be processed to yield whey protein in three forms: whey isolate, whey concentrate, or whey hydrolysate. The difference between the whey protein forms is the composition of the product, particularly the protein content. Whey isolates contain the higher percentage of pure protein and can be pure enough to be virtually lactose free, carbohydrate free, fat free, and cholesterol free. Whey isolates have had their base component (water) removed and are generally considered almost lactose and cholesterol free — they are typically at least 90% protein.
Protein Hydrolysateℹ The proteins extracted from whey, the aqueous part of milk, are subjected to a filtration process in order to remove the fat and carbohydrates. There are several different whey products: concentrate, isolate and hydrolysate. The main difference between these types consists of how the whey is processed, which can have influence on both production costs and the degree of purity.
Casein Proteinsℹ Casein is the most abundant protein in milk. It is relatively insoluble and tends to form structures called micelles that increase solubility in water. During the processing of milk, which usually involves heat or acid, the casein peptides and micelle structure become disturbed or denatured to form simpler structures. As a result, a gelatinous material is formed. This is the basis for why casein has a slower rate of digestion, and results in a slow but steady release of amino acids into circulation.
Sports NutritionSports Nutrition includes nutritional supplements that provide nutrient replenishment, higher quality of training, improve form, performance and regeneration. This category includes proteins, amino acids, gainers, fat burners, joint nutrition, anabolizers or vitamins and minerals. In a wide selection of quality nutritional supplements, every athlete will find products to help him achieve his fitness goals. These products can help you to push your limits. Whether you’ve got your nutritional routine sorted and want to stick to your favourites, or you’re building your nutrition plan from scratch. Before, during and after exercise, our extensive range of active sports nutrition provides something for everyone. Accepted some minutes before training, pre-workout sports food is key in priming your body and yielding energy and focus. Therefore after exercises essential amino acids and BCAAs which are the building blocks of protein are very important for recovery. And then the popular blends is your go-to exercise nutrient when you want to hit the HIIT. It is known to increase physical performance in successive bursts of short-term, high intensity exercise. For endurance training, sports supplements like electrolytes, carbohydrate bars, gels and drinks are the best training buddies. Find out more about our extensive range, suitable for your sport,…
Amino Acidsℹ Amino acids are organic molecules that consist of carbon, hydrogen and oxygen atoms, and in specific cases also sulfur atoms. All amino acids are formed by one carboxylic group (COOH), one amine group (NH2), one hydrogen molecule (H) and one side-chain, connected via a central carbon atom. The side-chain varies according to the amino acid, therefore each of the 20 existing amino acids has its own unique side-chain.
Arginine Amino Acidℹ Arginine is a semi-essential amino acid. This means that the body of an adult is capable of synthesizing the substance in amounts that are sufficient to meet the body’s needs. Just like other amino acids, arginine has a constructive function. It stimulates protein synthesis and provides nitrogen to all of the body’s tissues and cells.
EAAs Essential Amino AcidsEssential Amino Acids – EAA’s are comprised of 9 amino acids. They are: L-Leucine, L-Isoleucine, and L-Valine, L-Lysine, L-Threonine, DL-Phenylalanine, L-Histidine, L-Methionine, and L-Tryptophan. After an intense workout, EAAs are utilized to help prevent further muscle tissue breakdown as well as the stimulation of muscle protein synthesis.
BCAAs Amino Acidsℹ Amino acids play very important biological roles: the synthesis of proteins, enzymes, and hormones; in the transport of substances; synthesis of immunoglobulins and antibodies; in the regulation of acid-base balance in the body and may still be a source of energy, if a glycogen depletion occurs. They are the basic units that make up the proteins necessary for the growth and maintenance of tissues, being fundamental to the development of muscles, for muscle recovery, and to strengthen the body’s immune system. In order for the cells to produce the proteins required for their normal activity, there must be a constant intake of essential amino acids, either through food or dietary supplements. The intake of BCAAs activates the mTOR signaling pathway (activates protein synthesis) and contributes to increased muscle mass. Hypertrophy provides increased strength and endurance, improving athletic performance. Of all the amino acids that make up BCAAs, leucine is the main responsible for the activation of mTOR pathways. Physical exercise activates the phosphorylation of BCKDH (branched chain alpha-keto dehydrogenase complex), an enzyme complex that is responsible for the use of BCAAs and promotes protein catabolism.
L-Glutamine Amino Acidℹ Glutamine is considered a semi-essential amino acid, as it can be synthesized from other amino acids (glutamic acid, valine and isoleucine) inside the human body. It is produced inside the muscles and then distributed to the remaining organs via the bloodstream. For this reason, it is one of the most abundant amino acids present in muscle tissue, as well as in blood plasma circulating through the body. It makes up for approximately 60% of the existing free-form amino acids.
Recoveryℹ A selection of various ingredients, which can be nutrients but also herbal extracts for example, in order to replenish the body’s stores depleted due to physical exercise. The ingredients work synergistically to make it possible for the body to recover more quickly and efficiently.
Night RecoveryThere is a number of supplements containing specific amino acids and other substances which act by inducing relaxation and improving the quality of sleep. The main substances involved in promoting rest and sleep include tryptophan, melatonin and GABA.
Caffeineℹ Caffeine is classified as a chemical compound with a pharmacological effect rather than as a nutrient. However, it is also considered a supplement or active ingredient for dietary supplements. This ingredient can be found in multiple foods of daily use, such as coffee, green and black tea, guarana, coca cola, chocolate and even in energy drinks and gels.
Creatineℹ Creatine is a nitrogenous organic acid that occurs naturally in vertebrates. Its main role is to facilitate recycling of adenosine triphosphate (ATP), the energy currency of the cell, primarily in muscle and brain tissue. This is achieved by recycling adenosine diphosphate (ADP) to ATP via donation of phosphate groups. Creatine synthesis primarily occurs in the liver and kidneys. On average, it is produced endogenously at an estimated rate of about 8.3 mmol or 1 gram per day in young adults. Creatine is also obtained through the diet at a rate of about 1 gram per day from an omnivorous diet. Most of the human body’s total creatine and phosphocreatine stores are found in skeletal muscle, while the remainder is distributed in the blood, brain, and other tissues. Creatine supplements are used by athletes, bodybuilders, wrestlers, sprinters, and others who wish to gain muscle mass. Creatine has a fairly short elimination half-life, averaging just less than 3 hours, so to maintain an elevated plasma level it would be necessary to take small oral doses every 3–6 hours throughout the day.
Pre-Workoutℹ Pre-workouts are products of which the formulas can vary greatly according to the brand, and that can use ingredients ranging from amino acids to energetic substances and/or stimulants (such as caffeine or other ingredients with similar chemical activity), that improve performance and productivity.
Testosterone Supportℹ The biggest reason testosterone supplements are so widely used today is because almost all men end up suffering from low testosterone levels at some point in their lives. Generally, testosterone levels tend to gradually decrease when men reach their thirties. This decline in testosterone tends to get progressively worse over time, causing some serious problems. Low sex drive Reduced muscle mass Low energy levels Problems achieving and maintaining an erection Decreased semen production Hair loss If you suffer from one or more of these symptoms, you more than likely have Low Testosterone to some extent and could benefit significantly from an effective testosterone supplement. Men over 50 are the most likely to suffer from these issues. The main reason men seek natural testosterone supplements, is because they want to avoid testosterone replacement therapy.
Hormone Balanceℹ The supplements belonging to this category contain important nutrients for better health and well being. They’ve been especially selected to see to the specific needs of women. These supplements are formulated for the regulation of several bodily functions and help establish a healthy hormone balance and alleviate the main symptoms of hormonal imbalance, such as hot flashes, night sweats and a bad mood.
Cortisol controlℹ Cortisol is a hormone produced by the adrenal glands, and its synthesis is regulated by the pituitary gland in the brain. This hormone is commonly referred to as the stress hormone, seeing that the production of it rises significantly in situations of stress, whether physical or emotional, such as strenuous activity, illness, infection and injury. High levels of this hormone during periods of acute stress are not only beneficial but also reflect a survival mechanism: It increases the blood pressure, accelerates the heart rate, stimulates the glucose uptake, increases the appetite and accumulates a caloric reserve in the form of fat deposits, particularly around the belly. The accumulation of fat in the body is fundamental for survival in situations of starvation and food shortage. If there is enough food and the body is not being starved however, cortisol and abdominal fat are undesirable and unpleasant to the eye.
Sex Enduranceℹ These supplements consist of plant extracts, vitamins, minerals and amino acids which improve the energy levels and stimulate the production of natural hormones in the body. Increased serum levels of these hormones have a positive impact on sexual desire and sexual performance.
Sleep Helpℹ Sleep and rest are fundamental for the body to recover from day-to-day stress and the exhaustion caused by training regularly and intensely. Sleeping well not only affects cognitive performance but also physical shape, as it stimulates the secretion of growth hormone and contributes to the repair of muscle damage induced by intense exercise. Supplements like these contain substances that can help you fall asleep faster and/or prolong your sleep without interruptions.
Appetite Controlℹ These are substances or mixtures of substances that help control the appetite and increase the satiety, preventing excessive eating and the consequent piling up of calories. Because they help regulate the satiety, these supplements can be very useful for people who are dieting and wish to maintain or lose weight.
Fat Burnersℹ The stimulant substances in thermogenic fat burners act on the sympathetic nervous system and increase adrenaline release. This hormone acts on beta-adrenergic receptors of the cells, enabling the production of energy and increasing caloric expenditure. In adipocytes, beta-adrenergic stimulation promotes lipolysis and the release of fatty acids into the blood stream. Fatty acids in circulation serve as a substrate for energy production by cells of other tissues, particularly muscle tissue.
Weight Loss Creamsℹ Fat reduction creams have toning properties and help to eliminate localized fat deposits in the subcutaneous region, which includes areas that are usually more resistant to fat loss during the weight loss process. The use of these creams is a valuable aid in the elimination of stubborn fat deposits and helps tone the skin, which naturally tends to become more flaccid after significant weight loss, or simply due to aging.
L-Carnitineℹ L-Carnitine is an amino acid that is produced inside the liver and the kidneys of the human body itself, from the amino acids lysine and methionine. The substance can also be obtained from foods such as meat and dairy products. Approximately 98% of the body’s carnitine deposits is found in muscle tissue.
Fat Burners Stimulant Freeℹ The majority of fat burner products contains stimulants that act on the nervous system. These are commonly called thermogenics and can be very taxing on the body or cause side effects, especially in more sensitive individuals. Stimulant-free fat burners also facilitate fat loss, but in a far less aggressive way than thermogenics tend to do. Due to the absence of stimulants like caffeine, alanine, yohimbine or 7-Keto, they can be used at any time of the day, and can even be combined with stimulant-containing products like pre-workouts, thermogenics or energy stimulants.
CLAConjugated Linoleic Acid (CLA) is the umbrella term used to indicate all linoleic acid isomers, referring to a polyunsaturated fatty acid from the omega-6 family. Polyunsaturated fats are all the triglycerides that contain a fatty acid with more than one double bond in the molecule. CLA can be produced by the human body itself, although small amounts of it are found in foods such as full-fat milk and other dairy products. In even lower concentrations, it occurs in the meat of ruminant animals like cows. The CLA used in supplements is usually synthesized, mostly from safflower oil, by a process called isomerization.
Brain Health and Memoryℹ Brain function is positively affected by the use of dietary supplements that provide vital nutrients to the body and preserve the integrity of the brain cells. These supplements contribute to a better mental performance and stimulate concentration and memory. In addition to nourishing brain cells, the use of supplements can improve the blood supply to the brain, thereby increasing the effective distribution of nutrients and promoting the proper function of cognitive structures, along with developing more efficient logic and an improved ability to think clearly.
Coenzyme Q10ℹ Co-enzyme Q10, also called ubiquinone, is a substance with similar properties as vitamins and plays important biological roles. This substance is synthesized by the body in limited amounts and more must be obtained through dietary sources or supplements. The Co-enzyme Q10 is important because it stimulates electrolytes’ transport to the cell’s mitochondria and optimizes the energy production. It therefore contributes to a better mood and health, improves performance and muscle strength, delays fatigue and stimulates muscle recovery.
Hair, Hails & Skinℹ There are quite a few formulas on the market that are designed specifically to favor hair, skin and nails, aiming to maintain or restore health, beauty and youthfulness to these structures. In general, such supplements are rich in amino acids, vitamins (B complex as well as vitamins A, C, E), minerals (copper, zinc, selenium), collagen and antioxidant substances, that provide protection and stimulate cell renewal.
Eye Healthℹ These are supplements composed mainly of vitamins, minerals and other nutrients essential for good eye health. Apart from improving the eyesight, they also help prevent eye damage and various eye problems.
Immune Systemℹ The immune response is what activates the body’s natural defenses against stimuli that are harmful or compromise the body’s functions. The supplements belonging to this category stimulate the adaptation of the immune response to make it more effective, and help protect the body from the various attacks from outside it is exposed to every day.
Stress and Anxietyℹ Specific substances (e.g.: tryptophan, theanine and lipoic acid ) influence the balance of neurotransmitters, or affect the physiological responses that determine mood and the willingness of the body to overcome the challenges to which it is subjected.
Super Antioxidantsℹ Antioxidant supplements contain one or more ingredients capable of neutralizing substances that are toxic to the human body. Consuming antioxidants, whether by food or by supplementation, helps the body protect itself against cell damage caused by harmful molecules such as free radicals. As such, it slows down aging, accelerates recovery and diminishes muscle soreness, while also helping to prevent several health problems. Some of the most common antioxidant nutrients are beta-carotene, vitamin C, vitamin E, zinc, magnesium, copper, lycopene, selenium, coenzyme Q10, catechin, and methionine.
Women and Menopauseℹ These supplements often have very varied compositions. They generally combine a number of active ingredients, including vitamins, minerals and herbal extracts, whose therapeutic action minimizes the symptoms caused by hormonal changes during the menstrual cycle and menopause.
Bone and Joint Careℹ This term refers to a category of supplements containing minerals and vitamins that are fundamental to the process of bone mineralization. These can stimulate the calcification of the bones, preventing deformation and fractures. Some supplements contain ingredients that support the regeneration of cartilage and stimulate the production of synovial fluid, thereby promoting joint flexibility and function.
Glucosamineℹ Glucosamine is a monosaccharide, which is naturally produced in the body from glucose and glutamine. This substance is a precursor of glycosaminoglycans and proteoglycans, which are essential to the synthesis of connective tissue components and crucial to maintaining and renewing the health of tissues that make up the cartilage and joints. There are no food sources of glucosamine, so this substance must be obtained exclusively through the use of dietary supplements. Glucosamine supplements are produced from the exoskeleton of shellfish (shrimp, lobsters and crabs.
Heart and Cholesterolℹ These supplements contain substances such as omegas and other good fats which are important agents against inflammation, help maintain healthy joint function, increase the body’s fat burning capacity, promote a good mood and stimulate brain activity. Other ingredients, such as vitamin K and garlic extract, help prevent arterial stiffness, venous thrombosis and other circulatory problems. The specific vitamins and minerals are important for the correct formation of blood cells, that are responsible for the transport of nutrients to the body’s tissues and organs, as well as for the excretion of residual products resulting from cellular activity.
Omega 3ℹ Omega-3 is a type of fatty acid that is essential for normal growth and development of the body. As the body itself is unable to produce it, it must be obtained from food. Omega-3 fatty acids are polyunsaturated, meaning that they have two or more double bonds, and are characterized by having the first double bond in the third carbon atom. Several types of omega-3 exist: docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), both coming from animal sources, as well as alpha-linolenic acid (ALA), which is essentially found in vegetable sources. The body is able to convert ALA into EPA and DHA.
Vitamins & Minerals Vitamins & Minerals contain a mixture of micronutrients that are fundamental for the proper functioning of the body. Only small quantities of these are needed, contrary to macronutrients like carbohydrates, fat and protein. They are rich in vitamins A, B, C, D, E and others, as well as minerals such as calcium, magnesium, zinc, copper, iodine, selenium, molybdenum, etc. In some cases, they can also contain other extracts that have phytotherapeutic properties.
Vitamin Cℹ Vitamin C, also known as ascorbic acid, serves to ensure correct development and function of several structures in the human body. Its most important function is to help reinforce the immune system of the body. This vitamin can be obtained from several foods such as fresh fruit and vegetables. Broccoli, brussels sprouts and cauliflower are known to be high in vitamin C, and so are acid types of fruit, such as oranges, lemons, kiwis, tangerines and clementines. Ascorbic acid is a volatile vitamin, that is easily destroyed by heat, leaching – meaning that the vitamin is drawn from the food into the cooking water – the addition of bicarbonate, or oxidation – exposure to oxygen. During the time that food is stored or cooled, the vitamin levels can drop by more than 50%. For that reason, dietary supplements can be a good alternative or addition to the vitamin C obtained from food. The bioavailability of this vitamin as used in supplements is as good as that of the vitamin found in dietary sources.
Vitamin Dℹ Vitamin D, also called calciferol, is crucial for the normal development and balance of the body. The synthesis precursors of this vitamin can be found in foods of animal and vegetal origin: fish liver oil, chicken liver, egg yolks and industrially enriched food (eg.: margarines, cereals, etc.). However, these precursors require exposure to ultraviolet radiation in the body, to be converted to its active form and perform its activity. Hence, exposure to the sun, is a determining factor for the synthesis of the active form of vitamin D.
B-Complexℹ Complex B vitamins are usually not synthesized or stored by the body, so that it is necessary to consume them daily in adequate and meaningful doses. These vitamins can mainly be found in products of animal origin: meat, fish, poultry, eggs and dairy or derivatives. The main complex B vitamins are divided into: Vitamin B1 or Thiamine Vitamin B2 or Riboflavine Vitamin B3 or Niacin Vitamin B5 or Pantothenic Acid Vitamin B6 or Pyridoxine Vitamin B7 or B8 or Biotin Vitamin B9 or Folic Acid Vitamin B12 or Cyanocobalamin
Zincℹ Zinc is a very important mineral, is involved in the enzyme and hormone synthesis, and in numerous biological reactions essential to the normal function and development of the organism. This mineral supports the macronutrients’ metabolism process, contributes to the immune system and thyroid function and supports blood clotting and also the healing process of the skin. The food items, which are the richest in this mineral, are mainly meat, fish and seafood, dairy products and derivatives, nuts, vegetables and some seeds.
ZMAsℹ This supplement contains zinc, magnesium aspartate and vitamin B6. The minerals in this formula can also be found in foods like spinach, nuts such as almonds or cashews, whole grain cereals, beans, oysters, poultry and red meat. Fish, fruit and potatoes are considered good sources of vitamin B6.
Watersℹ The excitement is focused not only on creams and lotions you put on your skin but what you put into your body as well. Health experts say that vitamins and minerals in all forms play an integral role in a healthy complexion, whether the source is food, supplements, or even a jar of cream.
KFD NutritionKFD Nutrition’s products were rapidly launched on the market and gained popularity. This was due to several factors, mainly including: the highest quality and the lowest price at the same time, natural composition, without harmful and unnecessary additives, such as artificial colourings and thickeners, controversial sweeteners (e.g. aspartame) or preservatives, publication of research, including those recommended by independent persons or institutions that prove to 100% the composition declared on the label, KFD, unlike most manufacturers, relies to 100% on the transparency of activities, so that – in the era of increasing consumer awareness, KFD Nutrition continually expands its range of products, meeting the increasing demands of consumers. They launch products that have not been offered by other manufacturers, such as dessert protein, dietary jelly and even special seasonings for meats – chicken and pork.
Battery NutritionWhen it comes to the quality of our products, quite simply, we never compromise. We don’t, and never will, compromise on quality for a cost saving – just like we know that you wouldn’t when it comes to choosing what goes in to your body! We prefer to work with fewer suppliers than other companies and build long-term relationships with them. In this way, not only do we get the best prices, but we can absolutely guarantee the quality of every product we sell. The lowest prices and the highest quality are great, but that’s no good to you if we don’t have the products you want! Our wide selection of products has been designed to cover every aspect of your nutritional requirements, whatever your goal. Rest assured though, our experienced product development team are constantly looking for new and innovative ingredients to supply you with, alongside the development of industry-leading formulations.
NatrolNatrol Supplements We define quality as delivering safe, effective, and trustworthy products that meet consumers’ expectations every time. Our quality assurance program is extensive and industry leading. We perform rigorous quality checks throughout our process from exhaustive supplier qualification screening to the sourcing of the best ingredients. Natrol Supplements: We define quality as delivering safe, effective, and trustworthy products that meet consumers’ expectations every time. Our quality assurance program is extensive and industry leading. We perform rigorous quality checks throughout our process from exhaustive supplier qualification screening to the sourcing of the best ingredients. We have consistently achieved the highest “A” rating from the Natural Products Association. We constantly push the frontiers of research to develop vitamins, minerals and supplements that deliver better outcomes for our consumers and improve the quality of their lives.
Haya LabsHAYA LABS is set in 2011 and now is a leading manufacturer and worldwide distributor of high quality dietary supplements for health, wellness and sport. The company’s headquarters are established in Washington D.C., USA, and recently opened a new facility in London. United Kingdom for representation and distribution in Europe. Also the company works in partnership only with certificated facilities and top rated laboratories in United States and EU. The high quality raw materials comes from the best providers from all over the world. Profound innovative approach Natural ingredients No banned substances State-of-the-art factories Strict production control Portfolio of over 300 products “Our mission is to help millions of people all over the world to improve their quality and joy of life by encourage them to live healthy and to take care of their own bodies. To meet this challenge, we develop products which not only support health and sports goals but are manufactured with the purest raw materials. Therefore our supplements are the best addition to active life and good nutrition. We only work with the top-notch experts and we never compromise with the technological processes. Also we are passionate to give you the healthiest and safest supplements for…
BIOEARTHBIOEARTH Cosmetics Bioearth is a company based on research and innovation, but also on respect for the primary values of people’s health and environmental protection. A dynamic fusion of tradition, innovation, nature and technology. An ethics so important to us that it merges with our know-how, our research and our technology and which, in practice, we transform into virtuous products such as organic and natural ones. A new wealth, born from the fusion of solid principles, new knowledge and spread by a culture of the natural, which we hope will also benefit the generations to come. We at Bioearth have a holistic vision of the well-being of the person, which cannot disregard that of the environment. For this reason we have naturally evolved, as individuals and as a company, from a sterile egocentrism, to a broader, more inclusive and fruitful thought that includes nature. A holistic vision of man and the world, which adds concreteness to our project through a continuous dialogue with doctors, universities and research laboratories.
MilvaWe offer a wide range of products prepared mainly from natural ingredients. To guarantee both the their origin and quality, we at Milva work only with natural extracts prepared in our laboratory. Our products are made to solve specific cosmetic problems. We approach each problem individually and strive to resolve it as effectively as possible. We use only natural ingredients, the effectiveness of which is scientifically proven. Our raw materials are carefully selected and we perform full input and output control. Our product formulas are constantly being refined through continuous feedback from our happy customers and we react quickly and adequately according to their new requirements. We implement an effective company quality management system that ensures high efficiency and safety for all new products. Ecology: All raw materials used in the production of Milva products are environmentally friendly and degrade quickly in the nature. All materials used for packaging (cellulose, plastics, metals) recycle fully, 100%. We take responsibility both for people using our products and for the environment. All Milva products are produced in a closed cycle and do not emit any harmful emissions into the air, water or soil. Milva cosmetics are not tested and will never be tested…
Testosterone Support Products Testosterone and estrogen are the main sex hormones. Both men and women produce testosterone, but men make more. Women produce more estrogen than men. Testosterone Support Products make male sex organs grow when boys are developing.
It also supports male physical attributes such as facial hair growth, broader shoulders, and denser muscle development.
Sexual excitement is caused in part by a rise in testosterone, though other factors contribute.
Testosterone levels rise and fall throughout the day. Some men notice they are more excitable when testosterone is high, which is usually in the mornings.
Testosterone levels also fluctuate over your lifespan and start to decline after age 30.
This could mean a man has less interest in sex later in life, and possibly less firm erections as well as softer muscle tone.