Niacin as nicotinic acid, the plain form rather than the flush-free derivative.

Nicotinic acid sits at the centre of the NAD and NADP redox pairs, which is about as fundamental as a nutrient gets. Practitioners who want this form want it specifically, and substituting niacinamide is not the same thing.

One nutrient in a hypoallergenic capsule. Allergy Research Group has made supplements this way for more than 45 years.

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