NutriStack
Allopurinol and Vitamin B3, a conflict.
High-dose Vitamin B3 products that contain niacin or nicotinic acid can raise uric acid and have been associated with drug-induced gout. This can work against allopurinol's goal of keeping serum urate below target. The concern is mainly with lipid-dose niacin or high-dose supplements, not small dietary amounts.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Allopurinol and Vitamin B3
- Pair type
- Conflict
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- −10 to your Stack Score (per scored conflict row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Conflict · Moderate evidence
Conflict
What is happening. High-dose Vitamin B3 products that contain niacin or nicotinic acid can raise uric acid and have been associated with drug-induced gout. This can work against allopurinol's goal of keeping serum urate below target. The concern is mainly with lipid-dose niacin or high-dose supplements, not small dietary amounts.
Mechanism. Niacin can increase serum urate by reducing renal urate clearance and altering uric acid metabolism. That urate-raising effect conflicts with allopurinol's xanthine oxidase inhibition and may make urate targets harder to achieve.
Recommendation. Avoid starting high-dose Vitamin B3 while gout is active or serum urate is above target unless your clinician specifically recommends it. If niacin is necessary, check serum urate after starting or changing the dose and watch for new flares. Do not stop allopurinol during a flare unless your prescriber tells you to.
Sources (3)
- Ben Salem C, Slim R, Fathallah N, Hmouda H. Drug-induced hyperuricaemia and gout. Rheumatology (Oxford). 2017;56(5):679-688. PMID 27498351
- Kei A, Elisaf MS. Nicotinic acid: clinical considerations. Expert Opin Drug Saf. 2012;11(4):551-564. PMID 22564238
- Parsons WB Jr. Studies of nicotinic acid use in hypercholesteremia. Changes in hepatic function, carbohydrate tolerance, and uric acid metabolism. Arch Intern Med. 1961;107:653-667. PMID 13733026
Stack Score
How this pair moves the number.
Effect on the composite score
If both Allopurinol and Vitamin B3 are in the same stack, this pair applies −10 to your Stack Score (per scored conflict row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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