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Douglas Laboratories has been at the forefront of the nutritional health industry for over 50 years, engaging in the kind of top-notch product research and development that allows them to produce excellent science-based dietary supplements to help people improve their health. They offer one of the largest and most innovative selections of premium products as a healthcare practitioner brand and operate under a simple promise: provide the highest quality nutritional supplements available with the highest level of personal service—anywhere.
L-Arginine 500mg - 60 Capsules
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 product and sta...
L-Arginine 500mg - 60 Capsules
$16.50
L-Arginine 700mg - 100 Capsules
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 product and sta...
L-Arginine 700mg - 100 Capsules
$31.00
L-Glutamine - 60 Capsules
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 about this prod...
L-Glutamine - 60 Capsules
$15.50
L-Glutamine Powder - 250 Grams
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.
*FDA Disclaimer:...
L-Glutamine Powder - 250 Grams
$51.00
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-Serine - 60 Capsules
L-Serine supplies 500 mg of the amino acid in each capsule.
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 statemen...
L-Serine - 60 Capsules
$53.00
L-Theanine - 60 Capsules
L-Theanine supplies 100 mg of pure L-theanine in each vegetarian capsule. L-Theanine is an amino acid that may promote a sense of calmness.‡
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. Co...
L-Theanine - 60 Capsules
$42.50
L-Tryptophan - 60 Capsules
L-Tryptophan is an essential amino acid and a precursor for the synthesis of serotonin. Tryptophan crosses the blood-brain barrier and is converted to L-5-hydroxytryptophan (5-HTP), which in turn is converted into serotonin. Serotonin is an important neurotransmitter necessary for the regulation...
L-Tryptophan - 60 Capsules
$54.50
Liposomal Glutathione - 45 Softgel Capsules
Liposomal Glutathione contains 250 mg of glutathione in its active reduced form paired with a liposomal phospholipid complex to enhance absorption. Glutathione is an important nutrient in the body that supports antioxidant defenses, cellular function and liver detoxification pathways.‡
Dougl...
Liposomal Glutathione - 45 Softgel Capsules
$87.50
Liquid B12 - 30ml
Liquid B12 provides 1,000 mcg of highly bioavailable vitamin B12 and formulated with methylcobalamin in a tasty and convenient natural cherry-flavored liquid.
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used w...
Liquid B12 - 30ml
$20.00
Liquid Magnesium - 240ml
Liquid Magnesium supplies magnesium citrate in a great-tasting pomegranate flavored liquid, sweetened naturally with stevia.
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. Copyright © 2026.
...
Liquid Magnesium - 240ml
$38.50
Liquid Vitamin D3 - 22ml
Liquid Vitamin D3 is a unique, neutral-tasting, sugar-free liquid
supplying 25 mcg (1,000 IU) per drop of natural vitamin D3.
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. Copyright © 2026....
Liquid Vitamin D3 - 22ml
$32.00
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