L-Arginine

L-arginine is an amino acid your body uses to make nitric oxide, a molecule that helps blood vessels relax and widen. That is why arginine is popular for healthy circulation, exercise performance and healthy blood flow. Arginine also supports protein synthesis and immune function.

This collection includes L-arginine capsules and tablets, sustained-release arginine, arginine powder and arginine with citrulline from practitioner brands such as Thorne, Pure Encapsulations, Jarrow, Metagenics, Douglas Labs, Protocol for Life Balance, Endurance Products and NOW.

How to Choose an L-Arginine Supplement

• Sustained release: Releases arginine gradually for steadier levels. L-Arginine (Sustained Release) by Thorne is our top seller.
• Standard capsules: L-Arginine 700 mg by Pure Encapsulations is a popular pick.
• Arginine with citrulline: Citrulline converts to arginine in the body and helps keep arginine levels up longer. Arginine-Citrulline Sustain by Jarrow is an example.
• Powder: Makes larger amounts easier and costs less per gram.

Most people take 2 to 6 grams a day, often split into doses. Do not combine arginine with nitrate or PDE5 inhibitor medications, and talk with your practitioner first if you take blood pressure medication. See also heart health and sports nutrition.

Frequently Asked Questions

What does L-arginine do?

L-arginine helps your body make nitric oxide, which supports healthy circulation and blood flow. It also supports protein synthesis and immune function.

What is the difference between arginine and citrulline?

Citrulline is converted into arginine in the body. Many formulas combine them for longer-lasting support.

How much L-arginine should I take?

Most people take 2 to 6 grams per day. Follow the label or your practitioner's advice.

Is L-arginine good for workouts?

Many athletes use it to support blood flow and exercise performance. It is often taken before training.

Related categories: Cardiovascular Support | Sports & Fitness Nutrition | Amino Acids | Men's Health | Energy & Stamina

*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.