Single Amino Acids

Understanding Single Amino Acids: A Comprehensive Guide

Amino Acids are molecules that combine to form proteins. They are the building blocks of life. Roughly 500 amino acids have been identified in nature, but just 20 of them make up the proteins found in the human body. Eleven of these are made inside the body, while the remaining 9 must be supplied by food and, as needed, through supplementation.  Read more >

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  1. L-Arginine + L-Ornithine 500mg/250mg - 100 Caps

    HGH SUPPORT FORMULA WITH ARGININE & ORNITHINE. As we get past age 35, our body's production of growth hormone declines, eventually to less than 10% of what it once was. The amino acids l-arginine and l-ornithine help to optimize your own body's natural hgh production without the side effects or high expense of synthetic growth hormone. Optimum growth hormone levels promote fat loss, energy, im...

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  2. L-Arginine 1,000mg - 120 Tabs

    1000MG L-ARGININE FREE FORM AMINO ACID FROM NOW FOODS. This double strength free form amino, L-Arginine plays an important role in vascular health, immune function, growth hormone production and more. Providing a maximum 1000mg dosage per cap Now's L-Arginine looking potent support. L-Arginine is needed by the body to synthesize nitric acid, which in turn helps arterial walls relax allowing bl...

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  3. L-Arginine 500mg Free Form - 100 Caps

    500MG ACTIVE ARGININE in the superior "L" form. Arginine is considered an essential amino acid, which means that our bodies can not naturally produce it. However studies show that, for some individual's supplementation may offer an array of health benefits. Derived from natural sources, Now's arginine amino acid is free of binders and fillers and is suitable for many different clinical applica...

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  4. L-Arginine Powder - 454g

    100% PURE-FREE FORM L-ARGININE POWDER FROM NOW FOODS. L-Arginine plays an important role in vascular health, immune function, growth hormone production and more. Now's L-Arginine powder is easily absorbed providing 4.6g (2 teaspoons). L-Arginine is needed by the body to synthesize nitric acid, which in turn helps arterial walls relax allowing blood to flow easily throughout the body. L-Arginin...

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  5. L-Carnitine 500mg - 60 V-Caps

    PUREST FORM OF L-CARNITINE FROM NOW FOODS NOW uses only natural-form L-Carnitine, synthesized in a laboratory by a patented production process generating only L-Carnitine, and is vegetarian since it isn't obtained from an animal source and contains no animal by-products. NOW carnitine products are the same form as that found in nature (L-Carnitine), with no detectable levels of synthetic D-Car...

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  6. L-Carnitine 500mg - 180 V-Caps

    Supplementation with NOW® L-Carnitine 500mg can help support in recovery from exercise by reducing  muscle soreness after physical exertion. L-Carnitine is a non-essential amino acid that helps to maintain overall good health by facilitating the transfer of fatty acid groups into the mitochondrial membrane for cellular energy production. NOW® uses only Carnipure™, a special grade of L-Carnitine...

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  7. L-Carnosine 500mg - 50 V-Caps

    NOW® brings you their L-Carnosine 500mg as a source of antioxidants for the maintenance of good health in a vegan formula. L-Carnosine is classified as a dipeptide, which is a combination of two amino acids, in this case alanine and histidine. It naturally occurs in high concentrations in skeletal muscle tissue. L-Carnosine is also an antioxidant that stabilizes cellular membranes, protecting t...

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  8. L-Citrulline 750mg - 90 Caps

    750MG CITRULLINE. Citrulline is a non-essential amino acid that is an important intermediate in the urea cycle, functioning along with Arginine and Ornithine to rid the body of ammonia, a byproduct of protein metabolism. Because Citrulline is a precursor of Arginine, it provides a readily available source material for Arginine production, which in turn, can be used for the production of Nitric...

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  9. L-Citrulline Pure Powder - 113g

    Maintain healthy Arginine levels with the support of NOW® L-Citrulline Pure Powder. Citrulline is a non-essential amino acid that is an important intermediate in the urea cycle, functioning along with Arginine and Ornithine to rid the body of ammonia, a byproduct of protein metabolism. Because Citrulline is a precursor of Arginine, it provides a readily available source material for Arginine pr...

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  10. L-Cysteine 500mg - 100 Tabs

    500MG OF L-CYSTEINE FROM NOW FOODS NOW L-Cysteine is a non-essential amino acid that is an important component of hair, nails and the keratin of the skin. LCysteine stabilizes protein structure and aids in the formation of collagen, thereby promoting healthy skin, hair and nail texture and elasticity. [TABS]

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  11. L-Glutamine - 454g

    L-GLUTAMINE FROM NOW FOR POST-WORKOUT RECUPERATION. L-GLUTAMINE FROM NOW FOODS. Sometimes referred to as "brain fuel", L-Glutamine supports proper brain function and mental acuity. Glutamine is a versatile amino acid with many important functions in the body. Glutamine is found in large amounts in the muscles and helps to support muscle growth, prevent muscle-wasting and reduce stiffness and s...

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  12. L-Glutamine 500mg - 60 Caps

    L-GLUTAMINE FROM NOW FOR POST-WORKOUT RECUPERATION. L-GLUTAMINE FROM NOW FOODS. Sometimes referred to as "brain fuel", L-Glutamine supports proper brain function and mental acuity. Glutamine is a versatile amino acid with many important functions in the body. Glutamine is found in large amounts in the muscles and helps to support muscle growth, prevent muscle-wasting and reduce stiffness and s...

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  13. L-Glutamine 500mg - 120 Caps

    L-GLUTAMINE FROM NOW FOR POST-WORKOUT RECUPERATION. L-GLUTAMINE FROM NOW FOODS. Sometimes referred to as "brain fuel", L-Glutamine supports proper brain function and mental acuity. Glutamine is a versatile amino acid with many important functions in the body. Glutamine is found in large amounts in the muscles and helps to support muscle growth, prevent muscle-wasting and reduce stiffness and s...

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  14. L-Glutamine 1,000mg - 120 Caps

    L-GLUTAMINE FROM NOW FOR POST-WORKOUT RECUPERATION. 1000MG L-GLUTAMINE FROM NOW FOODS. Glutamine is a versatile amino acid with many important functions in the body. Sometimes referred to as "brain fuel", L-Glutamine supports proper brain function and mental acuity. Now's 1000mg L-Glutamine is a double strength formula popularly used in sports nutrition. Glutamine is found in large amounts in ...

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  15. L-Lysine 500mg - 100 Caps

    500MG OF THE ESSENTIAL AMINO ACID LYSINE. The amino acid lysine is classified as an "essential" amino acid because it cannot be manufactured by the body and must be ingested in either food or supplements. Depleted by stress, lysine is often used to help fight viral infections, including aggravating cold sores. Many people prone to cold sores increase their intake of lysine during stressful per...

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  16. L-Lysine 500mg - 250 + 100 Caps FREE

    500MG OF THE ESSENTIAL AMINO ACID LYSINE. The amino acid lysine is classified as an "essential" amino acid because it cannot be manufactured by the body and must be ingested in either food or supplements. Depleted by stress, lysine is often used to help fight viral infections, including aggravating cold sores. Many people prone to cold sores increase their intake of lysine during stressful per...

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  17. L-Lysine 500mg - 250 Tabs

    500MG OF THE ESSENTIAL AMINO ACID LYSINE. The amino acid lysine is classified as an "essential" amino acid because it cannot be manufactured by the body and must be ingested in either food or supplements. Depleted by stress, lysine is often used to help fight viral infections, including aggravating cold sores. Many people prone to cold sores increase their intake of lysine during stressful per...

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  18. L-Ornithine 500mg - 60 Caps

    500MG L-ORNITHINE FROM NOW FOODS. L-Ornithine is a non-essential amino acid; it is synthesized in the body from arginine and serves a number of important functions. Now's L-Ornithine contains 500mg per capsule and is popular among fitness enthusiasts and those wanting to cut fat. L-Ornithine promotes the metabolism of excess body fat and stimulates the release of growth hormone. L-Ornithine ha...

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  19. L-Ornithine 500mg - 120 V-Caps

    Support and maintain protein metabolism with L-Ornithine 500mg from NOW®. Ornithine is a non-essential amino acid that plays a central role in the urea cycle, functioning along with Arginine and Citrulline to rid the body of ammonia, a byproduct of protein metabolism. Because Ornithine is converted into Arginine, it can help to maintain healthy Arginine levels in the body. Ornithine can also be...

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  20. L-Phenylalanine 500mg - 120 Caps

    L-PHENYLALANINE FREE-FORM AMINO ACID FROM NOW FOODS. This essential amino acid is vital to overall brain and nervous system function. In the body phenylalanine can be converted to the amino acid tyrosine, which is used in the production of neurotransmitters: dopamine and norepinephrine (important for promoting alertness). Now offers a 500mg potency per capsule and is often recommended for prom...

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Essential Single Amino Acids: A Detailed Chart

Amino acids are molecules that combine to form proteins. They are the building blocks of life. Roughly 500 Amino acids have been identified in nature, but just 20 of them make up the proteins found in the human body. Eleven of these are made inside the body, while the remaining 9 must be supplied by food and, as needed, through supplementation. Let's explore the chart of necessary amino acids for good health.

A chart of essential amino acids include: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine, all of which are naturally abundant in foods such as beef, poultry, fish, eggs, dairy, soy, quinoa, and buckwheat. Other foods such as nuts, seeds, beans, and certain grains contain some but not all the essential amino acids. Thus, they are “incomplete proteins" and should be combined to supply all 9 essential amino acids.

When your diet is lacking, or if you're looking to stimulate physical performance, boost energy, stimulate muscle protein synthesis, support immunity, enhance digestion, and promote overall excellent health, nothing beats a good amino acid supplement. Besides forming proteins, amino acids are needed to produce enzymes, hormones, and neurotransmitters. They are also involved in numerous metabolic pathways within cells throughout the body. 

Key Benefits of Single Amino Acids for Wellness

  • Boost Muscle Building & Prevent Muscle Breakdown
  • Enhance Physical Performance
  • Help Balance Glycemia
  • Promote Neurotransmitter and Hormone Synthesis
  • Stimulate Energy Production

Determining the Need: Who Benefits from Single Amino Acids?

Amino acids may be recommended as a complex, which has the advantage of not throwing off your amino acid balance. Still, individual amino acids may also be recommended depending on a person's health status and goals and may be ideal for specific health challenges. Here's a chart of amino acids and which health concerns they support:

  • Tryptophan may be recommended to help regulate the sleep-wake cycle, appetite, sleep, mood, and pain.

  • Carnitine may be used to aid weight loss, improve exercise performance, and enhance a sense of well-being

There is a wide range of single amino acid supplements available on the market, each offering its own unique health benefits. For guidance on which amino acid(s) may be advantageous for you, speak to the knowledgeable staff at your favourite health food store or online retailer.

Varieties of Single Amino Acids: Potency & Formats Explored

Single amino acid supplements are widely available in capsules and powders and in fun gummy form for those suffering from pill fatigue. Amino acids are also frequently added to protein powders to enhance performance, boost muscle building, and speed post-exercise recovery. Each amino acid is offered in its own optimal dosing range. Always refer to the label instructions on your product to determine which dose is best for you. 

Insights & Considerations: Making the Most of Single Amino Acids

Most amino acid supplements, whether in combination or isolated form, are well tolerated and cause few side effects. However, if your dose is too high, you may experience certain side effects such as:

  • Gastrointestinal distress, including bloating
  • Abdominal pain
  • Changes in eating patterns
  • Diarrhea
  • Drop in blood pressure

Amino acid supplements should ideally be taken on an empty stomach between meals to get the most bang for your buck. However, when it comes to sports nutrition, athletes and strength trainers can take their amino acid supplement either before, during, after training, or any other time throughout the day when a meal or a shake isn’t possible or preferred.

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