Independent supplement ratingsUS and Canada · Updated weekly
A ratings desk for a category that has spent thirty years grading its own homework.
A ratings desk for a category that has spent thirty years grading its own homework.
Powder · 113 g · 75 servings
1,500mg citrulline / 3,000–6,000mg studied
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Same molecule, same clean label, half the dose and nearly double the price per gram. NOW sells pure L-citrulline at 1,500 mg per half-teaspoon, under the 3,000–6,000 mg the research runs on, so a studied serving means two scoops and a tub that empties twice as fast. At $0.27 a serving that's about eighteen cents per gram of citrulline against eleven for the Doctor's Best powder. Nothing wrong with the product; the arithmetic just favours the bigger tubs.
Half a level teaspoon, about 1.5 g, giving 1,500 mg of L-citrulline and five calories. Free-form citrulline again, so no malate conversion. The panel says about 75 servings in 113 g — read honestly against the trials, that's closer to 37.
Fine as a small tub to find out whether citrulline does anything for you. If it does and you keep buying it, the larger powders reach the trial dose in one scoop and cost less per gram.
Reviewed and fact-checked by the NFS editorial team · Last updated 08 Aug 2026