Stimulant-Free Nitric Oxide

Types of stimulant-free pump supplements

Stimulant-free nitric oxide products are built on amino acids and plant extracts rather than caffeine. The main ingredients are L-citrulline and citrulline malate (often in a 2:1 ratio), L-arginine and AAKG, with some products also using beetroot. Single-ingredient options come from Weider, Olimp Nutrition, Applied Nutrition and Kaged Muscle, while blends include Rule One Pump, Apex Pump and SciTec Hot Blood No-Stim. Formats include powders, capsules, tablets and shots.

Citrulline or arginine?

Both are amino acids used in pump products. Citrulline is the more common choice in modern formulas, but many people use both.