AI-researched information — not medical advice. Ask a qualified clinician before changing your diet or treatment.
Sugar-free C4 cans skip fructose but deliver 150–300 mg caffeine plus niacinamide, which may nudge uric acid upward in sensitive people.
The carbonated C4 Energy cans made by Nutrabolt are marketed as zero-sugar, with sweetness coming from sucralose and acesulfame potassium. Typical actives include beta-alanine (CarnoSyn), L-citrulline, 150–200 mg caffeine (up to roughly 300 mg in C4 Ultimate), taurine, L-tyrosine, and B vitamins including niacinamide and B12 [1]. None of these are purines, so the drink itself does not add purine load the way beer, sardines or liver do.
Fructose is the main reason sweet drinks trigger flares, and a zero-sugar C4 can sidesteps that. However, some C4 powdered or specialty lines use dextrose, maltodextrin or sugar, and those versions behave more like a sugary soda.
Caffeine is the second consideration. Moderate coffee intake is linked to lower gout risk, but a 200–300 mg hit of caffeine acts as a mild diuretic and can leave you under-hydrated, concentrating urine and urate. High-dose nicotinic acid (gram doses) is known to raise serum uric acid; the ~20–30 mg of niacinamide in a can is far lower and unlikely to matter much, but heavy daily use adds up. Beta-alanine, citrulline and taurine have no established urate-raising effect at supplement doses.
If you have gout, treat C4 as an occasional drink rather than a daily habit: pick a zero-sugar can, keep to one, and drink extra water alongside it. Skip it entirely during a flare, when dehydrated, or if you have hypertension, kidney disease or a caffeine sensitivity.