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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-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
L-Methionine
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 a...
L-Methionine
$29.50
L-Serine
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 ...
L-Serine
$53.00
L-Theanine
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 p...
L-Theanine
$42.50
L-Tryptophan
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
$54.50
Liposomal Glutathione
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.‡
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Liposomal Glutathione
$87.50
Liquid B12
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 an...
Liquid B12
$20.00
Liquid Magnesium
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. Copyri...
Liquid Magnesium
$38.50
Liquid Vitamin D3
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. Copy...
Liquid Vitamin D3
$32.00
Magnesium Citrate
Magnesium Citrate supplies 150 mg of elemental magnesium from bioavailable magnesium citrate in each convenient vegetarian capsule.
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission....
Magnesium Citrate
$19.00
Magnesium Glycinate
Magnesium (glycinate) is a highly bioavailable magnesium chelate, which supports the metabolism and utilization of carbohydrates, amino acids and fats for energy. Magnesium (glycinate) helps activate enzymes for physiological functions including cardiac health.‡
Douglas Laborato...
Magnesium Glycinate
$27.00
Magnesium Oxide
Magnesium Oxide supplies 300 mg of elemental magnesium from magnesium oxide 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: Th...
Magnesium Oxide
$11.50
Magnesium/Potassium Aspartate
Magnesium and potassium are minerals involved in important physiological functions that contribute to overall health.‡
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. Copyright © ...
Magnesium/Potassium Aspartate
$47.50
MCT/Butyrate Liquid with Sunbutyrate™
MCT/Butyrate Liquid with SunButyrate™ combines two unique ingredients to fuel the brain by way of ketone production. Ketones are energy-producing molecules made from fatty acids such as medium-chain trigylcerides (MCT) and butyrate triglycerides. MCT/Butyrate Liquid with SunButyrate™ provides hi...
MCT/Butyrate Liquid with Sunbutyrate™
$52.00
Melatonin 3 mg
Melatonin 3 mg capsules contain 3 mg of high purity melatonin produced under strict Good Manufacturing Practices (GMP) standards.
Douglas Laboratories' logo, text, trademarks, graphics, and photo images are the property of Douglas Laboratories, LLC and are used with permission. C...
Melatonin 3 mg
$16.00
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