Osterly Market L-Arginine – Nitric Oxide Precursor

L-arginine, single ingredient.

The amino acid your body converts to nitric oxide, sold as the amino acid it is.

What it's for

L-arginine is a precursor to nitric oxide, which relaxes blood vessel walls and increases blood flow. It is taken for circulation and for exercise pump. Worth knowing: oral arginine is heavily broken down in the gut and liver before it reaches circulation, which is why citrulline — which converts to arginine after that first pass — often outperforms it in trials.

How to take it

• Take on an empty stomach, around thirty to sixty minutes before exercise if using it for that
• Food, particularly protein, competes with its absorption
• Can cause stomach upset and loose stools at higher doses
• Do not combine with ED medication or nitrates without medical advice — both work on the same pathway and the combination can drop blood pressure

On the label

• Pure L-arginine, 100 capsules
• Single ingredient, no stimulant stack
• Nitric oxide precursor

What this is not

• Not citrulline, which absorbs better for the same purpose
• Not a stimulant
• Not to be stacked with nitrate medication

The straight answer

On the label: the bottle is branded "Rock Solid" and the supplier markets it for sexual performance. The contents are plain L-arginine. If you want the better-absorbed option for circulation, citrulline is the one the research favours.

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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. Talk to your doctor before starting any supplement, especially if you are pregnant, nursing, or taking prescription medication.