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the Vitamin Shoppe
L-Citrulline - Free-Form Amino Acid - Nitric Oxide Booster - 3,000 MG - Tropical Flavor (10.7 oz./66 Servings)
L-Citrulline - Free-Form Amino Acid - Nitric Oxide
- Supports nitric oxide production
- Promotes exercise endurance and cardiovascular health
- Free of gluten, dairy, soy, and nuts
- Tropical flavor
Whether you're a weightlifter, runner, or simply mindful of your cardiovascular wellness, l-citrulline can help. The body converts this free-form amino acid into nitric oxide, which is a vasodilator that promotes endurance, healthy circulation, and increased blood flow to working muscles.
Rated 4 stars out of 5 stars, From 10 customer reviews
$29.99
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the Vitamin Shoppe
Glycine Powder – 3,000 MG – Restful Sleep & Nervous System Support (8 oz./75 Servings)
Glycine Powder – 3,000 MG – Restful Sleep
- Promotes restful sleep
- Provides nervous system support
- Free-form amino acid
- Non-GMO
- Free of gluten, diary, soy, nuts, and synthetic colors
Having trouble getting your full eight hours of shut-eye? Meet The Vitamin Shoppe^® brand Glycine Powder. In addition to supporting your nervous system, this non-essential amino acid can also help you enjoy a night of restful sleep.

Frequently Asked Questions

What are amino acids?

Amino acids are molecules that come together to form proteins. There are 22 amino acids that are required by humans, and 9 of which must be consumed in our everyday diet.

What are non-essential amino acids?

A non-essential amino acid is an amino acid that your body can create on its own. There are 11 non-essential amino acids: alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine.

What is a free-form amino acid?

A free-form amino acid is an unbonded amino acid that is more efficiently absorbed by the body.
Rated 4 stars out of 5 stars, From 3 customer reviews
$14.99
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Prolab Nutrition
Glutamine 1000mg- Essential Amino Acid for Muscle Form and Function (2.2 lb./ 222 servings)
Glutamine 1000mg- Essential Amino Acid for Muscle Form
L-Glutamine is a flavorless, easy-mixing powder and an extremely versatile free form amino acid formula. It is the most abundant, naturally occurring amino acid in muscle tissue, but it can be depleted during prolonged training. Supplementing with L-Glutamine replenishes depleted stores, to help build new lean muscle and protect hard-earned gains by supporting protein synthesis. L-Glutamine also supports acid-base homeostasis. L-Glutamine supports post-workout muscle energy repletion, volumization, and repair. This "conditionally essential" amino acid functions as a critical factor in muscle form and function.† Supports Muscle Cell Volumization And Muscle Development Taking L-Glutamine supplements will help you improve exercise performance and gain muscles. The supplement also hydrates your body cells which are critical for repair and growth. Replenishes Depleted Glutamine Levels When one is stressed, ill, or injured, the L-Glutamine levels will go down, causing your body to look for the amino acid in your muscles to fill the gap. Glutamine supplements can support faster recovery for several ailments.
$59.99
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Zhou Nutrition
Collagen Peptides Powder - Grass Fed & Pasture Raised Hydrolyzed Protein - Unflavored (46 Servings)
Collagen Peptides Powder - Grass Fed & Pasture
- Bone Health*
- Joint Mobility*
- Skin Cell Health*
- Essential Amino Acid Source*
- Hair & Nail Strength*
- Healthy Gut Support*
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Rated 5 stars out of 5 stars, From 439 customer reviews
$46.99
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What is Doctor’s Best?

For over three decades, the Doctor’s Best brand has taken a science-based approach to making nutritional dietary supplements to promote overall well-being and healthier living.

What are the different types of Doctor’s Best supplements?

The product line from this brand includes a range of supplements, including the following popular varieties:

Doctor’s Best Magnesium

Important for many chemical reactions throughout the body, magnesium is an essential mineral. Doctor’s Best high-absorption magnesium supplement comes in convenient tablets and flavored powder so you can choose the format you prefer.

Doctor’s Best CoQ10

Coenzyme Q10 plays a role in cellular energy production and helps protect cells against free radical damage. Find this supplement from Doctor’s Best in capsules, softgels, and gummies in a variety of strengths and quantities.

Doctor’s Best MSM

Methyl-sulfonyl-methane, also known as MSM, is an important nutrient for joint health and flexibility as well as immune support. Doctor’s Best makes Glucosamine Chondroitin MSM formulas for joint support as well as a powdered MSM supplement that easily mixes into drinks.

More Supplements from Doctor’s Best

Additional products from this line include curcumin, serrapeptase, vitamins, amino acids, ubiquinol, and more supplements for various health concerns.

Where to buy Doctor’s Best

We carry a range of Doctor’s Best brand products at The Vitamin Shoppe. Shop online and get free in-store pickup and even free shipping on qualifying orders.

Find Supplements at The Vitamin Shoppe Store Near You

There are more than 600 The Vitamin Shoppe® stores across the US, so it's very likely you can pop in and find Supplements locally. Check out our store locator to find a Shoppe near you. Don’t forget—you’ll save at least 15% on every subscription with Auto Delivery, plus an addition 5% off select brands to help you stay on the path. Not only will you never miss a thing, but you’ll also get free shipping on subscription refills of $25 or more!* You define what better looks (and feels) like—Count on us to help you get there.

Shipping & Returns

FREE for Orders over $35

Orders under $35, domestic shipping is only $6.99. Find more at our Shipping Policy page.

Return Policy for Items Purchased Online

Shop with confidence with our Easy Returns Policy. Customers may return any opened or unopened merchandise purchased from any Vitamin Shoppe channel to any Vitamin Shoppe store within 30 days. Find more at our full Returns Policy page.

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