B3 (Niacin) by Drs Advantage
Sold as “Dr's Advantage Vitamin B3 Dropper 2oz”
Heliocare
Niacin 500 mg, Fernblock® Polypodium leucotomos (Calaguala) extract (leaf) 240 mg
THORNE
Niacin 500 mg
NOW
Nutricost
Niacin (as nicotinic acid) 500 mg
Niacin (as nicotinic acid) 100 mg
NOW Foods