Vitamin C for Gout

Vitamin C lowers serum uric acid modestly — around 20 micromoles per litre in trials — and associates with lower gout incidence in large cohorts. It is a reasonable adjunct for prevention but far too weak to replace urate-lowering therapy in established gout.

Overview

Verdict

Mixed evidence

How It Works

Vitamin C competes with urate for renal tubular reabsorption, increasing uric acid excretion, and its antioxidant action may reduce purine oxidation. The resulting urate reduction is real but small — a fraction of what allopurinol achieves when titrated to target.

Dosing & Protocol

Typical dose

Recommended dose: 500 mg vitamin C daily with food
Expected timeframe: 8-12 weeks for a small urate change

Protocol

form: Ascorbic acid or sodium ascorbate
duration: 8-12 weeks with a serum urate measurement at baseline and end
co factor: Take with food. Evidence is mixed and the distinction matters: 500 mg/day lowers serum urate by a small amount (roughly 20-35 micromol/L) through increased renal urate excretion, but a randomised trial in people with established gout found vitamin C did not meaningfully lower urate in patients already on allopurinol and did not reduce flares. It is a marginal adjunct, not a treatment.
titration: No escalation - trials used 500 mg/day and higher doses were not more effective for urate
starting dose: 500 mg ascorbic acid once daily with food

Evidence

What the studies say

A 2011 meta-analysis of RCTs found roughly 500 mg daily vitamin C reduced serum urate by about 20 micromoles per litre, and the large Health Professionals cohort associated higher vitamin C intake with substantially lower gout incidence. However, a later trial in established gout patients on allopurinol found vitamin C added no clinically meaningful urate reduction. The fair verdict: useful for risk reduction in high-urate individuals, not a treatment for those already flaring.

Clinically Insignificant Effect of Supplemental Vitamin C on Serum Urate in Patients With Gout: A Pilot Randomized Controlled Trial

Score: 8/10

2013

rct

Stamp LK, Frampton C, O Donnell JL +2 more

Studies in human volunteers have shown that vitamin C reduces serum urate (SU) levels. The aim of this study was to determine the effects of vitamin C on SU levels in patients with gout.

View source

Safety

Caveats

Vitamin C does not replace urate-lowering therapy. Gout is a treatable disease and the target is serum urate below 360 micromol/L (or 300 in tophaceous disease), achieved with allopurinol or febuxostat - untreated, it causes joint destruction, tophi and kidney stones. A single acutely hot, swollen joint with fever can be septic arthritis rather than gout and is an emergency. Safety ceiling: the tolerable upper intake level is 2000 mg/day; higher doses cause diarrhoea and raise oxalate kidney stone risk, which matters here because gout patients already have elevated stone risk. Avoid high doses in kidney disease, haemochromatosis and G6PD deficiency. Safe in pregnancy at normal doses.

Less likely to help if

People with established gout already on allopurinol, in whom the randomised trial showed no added urate lowering.

Medical Disclaimer

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Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.