Sourcing Nicotinic Acid: Grading, Purity, and Vetted Products

Why sourcing matters

When niacin is taken at the RDA (14-18mg), sourcing is irrelevant. At therapeutic doses of 1-3 grams per day, you're consuming 100x more — manufacturing contaminants, filler quality, and dissolution profiles all matter.

The key distinctions: USP-verified vs. USP-claimed, pharmaceutical grade vs. food grade, whether a Certificate of Analysis (COA) is available and from an independent lab.

What to look for

Form: Immediate-release nicotinic acid (not "flush-free", not sustained-release)
Grade: USP or pharmaceutical grade preferred
COA: Independent third-party analysis, not just manufacturer's own
Purity: ≥99% for gram-scale use

Vetted products

These are nicotinic acid products (not niacinamide) — the form studied in the GPR109A and immune regulation literature. We have not independently tested purity or grade.

PureBulk Niacin (Nicotinic Acid)

direct buy

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Direct-buy option. Pure powder, flexible dosing, COA available. Use code QIIUWINTKD for 10% off.

BulkSupplements Nicotinic Acid Powder — 1 kg

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Pure nicotinic acid powder. No fillers, flexible dosing. Best value for gram-scale use.

BulkSupplements Nicotinic Acid Powder — 100g

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Smaller quantity for trying nicotinic acid. Same pure form, lower commitment.

Niacin.io may earn a small commission on qualifying purchases at no extra cost to you. We only link products listed as nicotinic acid — not niacinamide. We have not independently verified purity.