Vitamins

Vitamin B3 (niacin)

A B vitamin, also called niacin, from meat, fish and grains. Your body needs it to get energy from food. Niacin (not niacinamide) can cause a hot, red flush.

117 products from US online stores, sorted by what 25 mg of vitamin B3 costs – not by the price per pack.

6.4¢Lowest cost
per 25 mg vitamin B3

Prices checked Nov 1, 2026, US
No paid placements

What does 25 mg mean?

vitamin B3 per serving in most of the products we checked: 100–1,000 mgvitamin B3 per serving in most of the products we checked

25 mg is a fixed amount to compare by: half of the 117 products we checked have up to 500 mg per serving, the other half more.
25 mg is more than the 14–16 mg recommended a day for adults (NIH (opens in a new tab)).

We compare by 25 mg only so products line up – it’s not a recommendation. Not medical advice.

Where products miss quality points

How the 117 products score

Very good 90+: 2
Good 75+: 114
Fair 60+: 1
Low under 60: 0

have no seal from an independent testing program: 98%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 11 whose label says “third-party tested”

The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.

We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works

How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check

The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.

How we calculate

Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.

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Vitamin B3 (niacin)

What does 25 mg mean?

Where products miss quality points

Pack size

Niacin, Strawberry, 25 mg