None.
Made without: GMOs, milk, soy, eggs, yeast, wheat, rose hips, peanuts, tree nuts, fish, crustacean shellfish, animal products, fillers, binders, excipients, lubricants, starch, sweeteners, colorings, flavorings, and preservatives.
Our promise and guarantee: We use only 100% pure pharmaceutical grade L-ascorbic acid USP-FCC† (C6H8O6), which contains no corn residue, plant antigens, or protein impurities.
†United States Pharmacopoeia - Food Chemical Codex.