Vitamin C does not lower uric acid levels in gout patients

Despite previous studies touting its benefit in moderating gout risk, new research reveals that vitamin C, also known ascorbic acid, does not reduce uric acid (urate) levels to a clinically significant degree in patients with established gout. Vitamin C supplementation, alone or in combination with allopurinol, appears to have a weak effect on lowering uric acid levels in gout patients according to the results published in the American College of Rheumatology (ACR) journal, Arthritis & Rheumatism.

Gout is an inflammatory that causes excruciating pain and swelling triggered by the crystallization of within the joints. Estimates from the ACR report that more than 8.3 million Americans suffer with gout. Medical evidence reports that long-term gout management requires treatment with medications that lower urate levels by inhibiting uric acid production (allopurinol) or increasing uric acid excretion (probenecid) through the kidneys.

"While current treatments are successful in reducing the amount of uric acid in the blood, there are many patients who fail to reach appropriate urate levels and need additional therapies," explains lead author, Prof. Lisa Stamp, from the University of Otago in Christchurch, New Zealand. "Vitamin supplementation is one such alternative therapy and the focus of our current study, which looked at the effects of vitamin C on urate levels in patients with gout."

The team recruited gout patients who had urate levels greater than the ACR treatment target level of 0.36 mmol/L (6 mg/100 mL). Of the 40 participants with gout, 20 patients already taking allopurinol were given an additional 500 mg dose of vitamin C daily or had the dose of allopurinol increased, while another 20 patients not already taking allopurinol were either started on allopurinol or vitamin C (500 mg/day). Researchers analyzed blood levels of vitamin C (ascorbate), creatinine and uric acid at baseline and week eight.

Study findings show that a modest vitamin C dose for eight weeks did not lower urate levels to a clinically significant degree in gout patients, but did increase ascorbate. The results differ from previous research which found that vitamin C reduced urate levels in healthy individuals without gout, but with high levels of uric acid (hyperuricemia). In fact, the Stamp et al. study found that reduction of uric acid was significantly less in gout patients taking vitamin C compared to those who started or increased their dose of .

"Though vitamin C may reduce of developing gout, our data does not support using vitamin C as a therapy to lower uric acid levels in patients with established gout," concludes Prof. Stamp. "Further investigation of the urate lowering effects of a larger dose in those with is warranted."

More information: "Clinically insignificant effect of supplemental vitamin C on serum urate in patients with gout; a pilot randomised controlled trial." Lisa K Stamp, John L O'Donnell, Christopher Frampton, Jill Drake, Mei Zhang and Peter T Chapman. Arthritis & Rheumatism; Published Online: May 16, 2013 (DOI: 10.1002/art.37925).

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Mauricio
1 / 5 (1) May 16, 2013
one of the worst studies I ever read!

1. no blind placebo control condition
2. they did not evaluate dose dependent function. They should had have different groups with different doses: 500, 1000, 2000, 3000 milligrams.
3. 500 milligrams is a very low dose of vitamin C, regardless what the government advices. Many studies have found that vitamin c is effective at larger doses for many problems.