The short answer · Niacin status
Take niacinamide for niacin status. This is the one to buy.

NOW Foods, Niacinamide, 500 mg, 100 Veg Capsules
4.7· 11,565 ratings· $0.08/serving
Niacinamide 500 mg — inside the studied 15-500 mg window
Of 2,610 products scored for Niacin status, NOW Foods, Niacinamide, 500 mg, 100 Veg Capsules ranks #1 with a DoseRank score of 88. Niacinamide is the strongest evidence signal for this outcome.
The form“Why Niacinamide — not Niacin or Nicotinic Acid?”Evidence Strong evidence
Niacinamide is the strongest evidence signal for this outcome.
- NiacinamideThe pick
Strong evidence · 500 mg
Non-flushing form of vitamin B3; serves as a NAD+ precursor for energy metabolism and DNA repair, and is preferred over niacin when avoiding flush.
- Niacin
Strong evidence · 500 mg
Vitamin B3 as nicotinic acid; a NAD+ precursor that can raise HDL but causes a prostaglandin-mediated skin flush at higher doses.
- Nicotinic Acid
Strong evidence · 500 mg
The free-acid form of niacin (vitamin B3); raises HDL and lowers triglycerides at gram-level doses, but causes pronounced skin flushing that limits compliance.
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NOW Foods, Niacinamide, 500 mg, 100 Veg Capsules ranks #1 for Niacin status with a DoseRank score of 88. The score blends clinical strength, evidence, dose fit, trust signals and value across 2,610 products scored for this outcome.