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Amino acids are the building blocks of protein and support cellular growth. There are 20 different types and only 11 of these can be made in the body. The remaining 9 are called essential amino acids and must be obtained through your diet. Amino acids are essential for your health and wellness and come in variety of forms and concentrations.
L-Arginine - Sustained Release
L-arginine is a conditionally essential amino acid, meaning that while your body can make it, it becomes necessary to get it in through diet or supplementation under certain circumstances or for certain physical conditions. L-arginine, like other amino acids, is a building block of protein, whic...
L-Arginine - Sustained Release
$22.00
L-Carnitine
L-Carnitine plays a role in free fatty acid metabolism and metabolic health and is required for the breakdown of fats and glucose into energy. Decreased levels of L-carnitine have been observed during pregnancy, supplementation has been shown to help improve plasma levels.*
Metag...
L-Carnitine
$34.95
L-Carnitine 500 60 Capsules
L-Carnitine L-Tartrate
A dietary supplement containing the levo-enantiomers of carnitine and tartrate with potential chemoprotective and antioxidant activities.
L-carnitine L-tartrate increases fatty acid oxidation and reduces purine catabolism and free radical formation, which may prevent exerc...
L-Carnitine 500 60 Capsules
$46.00
L-Glutamine Powder
Free Form Glutamine for Healthy Gut Barrier Function*
Delivers free-form L-glutamine to help promote optimal muscle growth and strength.* Offered as a powder to mix in your favorite drink.
Gluten Free Dairy Free Soy Free Vegetarian Non-GMO Vegan
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L-Glutamine Powder
$83.49
L-Glutamine Powder
L-glutamine is the most abundant amino acid in human muscle and blood plasma, supporting cellular integrity throughout the body and brain.◆ It is a conditionally essential amino acid, meaning the body’s demand for it increases during instances of stress and/or prolonged physical activity.L-gluta...
L-Glutamine Powder
$42.25
L-Glutathione
NutriDyn’s L-Glutathione supports the body’s natural defense system with patented Setria® glutathione to support healthy immune function, promote detoxification, and encourage healthy oxidative stress response.◆The body produces its own glutathione but poor diet, stress, pollution, toxins, and ...
L-Glutathione
$46.00
L-Lysine
L-Lysine is an essential amino acid the body uses as a building block for protein and producing enzymes, collagen, and healthy immune cells.◆ Humans need to consume L-Lysine through food or supplementation to help support healthy immune system functioning, promote healthy connective tissues, and...
L-Lysine
$17.65
l-Lysine
L-Lysine supports natural immune defenses and promotes healthy gum and lip tissue for adults seeking wellness‡
Benefits & Features
Supports the body's natural immune defenses‡
Promotes healthy gum and lip tissue‡
Made with high-quality vegan ingredients backed by verifiable science
Indi...
l-Lysine
$15.50
L-Lysine 120 Vegetarian Capsules
Healthy Immune Balance*
L-Lysine is an essential amino acid that helps to promote normal tissue repair, healthy energy production, proper fatty acid metabolism, and a healthy immune response.*
Gluten Free Dairy Free Soy Free Vegetarian Non-GMO Vegan
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L-Lysine 120 Vegetarian Capsules
$38.99
L-Lysine 90 Vegetable Capsules
L-Lysine from Progressive Laboratories provides 500 mg of the L-lysine per vegetable capsule. Lysine is an essential amino acid needed for growth and to help maintain nitrogen balance in the body.‡ (Essential amino acids cannot be made in the body and must be supplied by the diet or supplements)...
L-Lysine 90 Vegetable Capsules
$20.00
L-Methionine - 60 Capsules
L-Methionine supplies 500 mg of this essential amino acid.
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. Copyright © 2026.
*FDA Disclaimer: The information about this product and statement...
L-Methionine - 60 Capsules
$29.50
l-Theanine
L-Theanine promotes calm relaxation and mental clarity while supporting healthy cellular function and moderating caffeine effects‡
Benefits & Features
Promotes relaxation without causing drowsiness‡
Supports healthy cellular function‡
May help moderate the effects of caffeine on the cen...
l-Theanine
$65.50
L-Theanine Pro
L-Theanine Pro is a valuable addition to any comprehensive approach to support stress management and promote cognitive enhancement.◆ When ingested, L-theanine readily crosses the blood-brain barrier and acts upon the central nervous system without causing sedation or dependence.◆ With its well-...
L-Theanine Pro
$31.00
L-Tryptophan
Supports Healthy Mood and Promotes Calmness.◆
NutriDyn® and its associated trademarks are the property of Nutri-Dyn Midwest, Inc. and are used with permission. Oakway Naturals is an independent retailer and is not owned or operated by NutriDyn, Inc.
⚠️ WARNING: This product can expose you t...
L-Tryptophan
$41.40
L-Tyrosine
Tyrosine is a non-essential amino acid that is synthesized in the body from phenylalanine. As a building block for several important brain chemicals, tyrosine is needed to make epinephrine, norepinephrine, serotonin, and dopamine, all of which work to support mood.◆ Tyrosine also aids in the fun...
L-Tyrosine
$19.50
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