The L-citrulline research consistently uses 3000-8000mg doses. Most consumer products underdose. Here's the data.
What L-citrulline does
Non-essential amino acid. Converts to L-arginine in the kidneys. Raises plasma arginine more effectively than oral arginine itself due to first-pass metabolism.
The research dose
Studies showing nitric oxide modulation, vascular response, and exercise performance support consistently use 3000-8000mg. Below 3000mg the effect size collapses.
Why most products underdose
Cost. 3000mg per serving is significantly more expensive than 800-1500mg. Brands round down to protect margin and rely on flavor, branding, and 'enhanced' marketing copy to sell.
What VASC-U-BULL does
3000mg L-citrulline malate per serving. Stacked with pine bark (95% proanthocyanidins), beetroot extract for nitrate, L-arginine HCl, niacin, and horny goat weed icariin. Stim-free.