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L-5-MTHF 1,700 mcg DFE (1 mg)
Methylated Folate
Folate (vitamin B9) is provided in its biologically active form, L-5-MTHF, which supports normal methylation and homocysteine balance.*
Bioactive folate as Quatrefolic® [6S]-5 methyltetrahydrofolate to support folate status and promote normal methylation.*
• Supports folate st...
L-5-MTHF 1,700 mcg DFE (1 mg)
$57.49
L-5-MTHF 8,500 mcg DFE (5 mg)
Methylated Folate
Folate (vitamin B9) is provided in its biologically active form, L-5-MTHF, which supports normal methylation and homocysteine balance.*
Bioactive folate as Quatrefolic® [6S]-5-methyltetrahydrofolate to support folate status and promote normal methylation.*
• Supports folate st...
L-5-MTHF 8,500 mcg DFE (5 mg)
$91.49
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, whi...
L-Arginine - Sustained Release
$22.00
L-Arginine 500 mg
L-Arginine capsules contain 500 mg pure, crystalline L-arginine.
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 p...
L-Arginine 500 mg
$16.50
$8.25
L-Arginine 700 mg
L-Arginine capsules contain 700 mg pure, crystalline L-arginine.
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 pro...
L-Arginine 700 mg
$31.00
$15.50
L-Arginine Plus
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 Plus
$39.05
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.*
L-Carnitine
$34.95
L-Carnitine 500
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
$46.00
L-Glutamine
Free-Form Glutamine for Healthy Gut Barrier Function*
Delivers free-form L-glutamine to support healthy mucosal cell function in the GI tract and immune health.*
Delivers 850 mg of L‑glutamine per capsule.
• Promotes optimal glutamine status*• Supports gut barrier function*• Supports muscle gro...
L-Glutamine
$49.99
L-Glutamine
L-Glutamine 500 mg capsules contain 500 mg of pure crystalline L-glutamine.
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 abo...
L-Glutamine
$15.50
$7.75
L-Glutamine Powder
A key amino acid for intestinal health and immune function, providing 4 g of pure L-glutamine per serving.‡
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. Copyright © 2026.
*FD...
L-Glutamine Powder
$51.00
$25.50
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-glu...
L-Glutamine Powder
$42.25
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
Designs for Health's logo, text, trade...
L-Glutamine Powder
$44.50
L-Glutamine Powder
L-Glutamine Supplement
L-glutamine. Free form amino acid, high purity, well tolerated. L-glutamine supports the development of enterocytes, a type of cell that is plentiful in the epithelial lining of the gastrointestinal tract.* L-glutamine also supports muscle glycogen stores, growth hormo...
L-Glutamine Powder
$65.39
L-Glutamine Powder
Free Form Glutamine for Healthy Gut Barrier Function*
Delivers free-form L-glutamine to support healthy mucosal cell function in the GI tract and immune health.* Offered as a powder for individuals with difficulty swallowing.
3 g of L‑glutamine per serving in an unflavored/unsweetened powder.
•...
L-Glutamine Powder
$58.99
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