Vitamin B2

Riboflavin is not known to have any clinically relevant interactions with medications. — per the NIH Office of Dietary Supplements; general information, not medical advice.

Horbäach Vitamin B2 100mg | 180 Capsules | Riboflavin Supplement | Non-GMO… at $0.05 per serving — the lowest cost-per-dose vitamin b2 in our catalog. See the full ranking on the Best Vitamin B2 page.

We're tracking 58 active Vitamin B2 deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.

Across 45 tracked Vitamin B2 deals the median cost-per-dose is $0.125; the cheapest quartile comes in under $0.083 per serving. Anything below the median is a solid deal for the same molecule.

Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.

Intakes of riboflavin from food that are many times the RDA have no observable toxicity, possibly because riboflavin's solubility and capacity to be absorbed in the gastrointestinal tract are limited. Because adverse effects from high riboflavin intakes from foods or supplements (400 mg/day for at least 3 months) have not been reported, the FNB did not establish a Tolerable Upper Intake Level (UL) for riboflavin; however, the FNB urges people to be cautious about consuming excessive amounts. — per the NIH Office of Dietary Supplements.

Groups most likely to have inadequate riboflavin status include vegetarian athletes; pregnant and lactating women (and their infants) who rarely consume meats or dairy; people who are vegan and/or consume little milk; and people with riboflavin transporter deficiency. The signs and symptoms of riboflavin deficiency (ariboflavinosis) include skin disorders, hyperemia and edema of the mouth and throat, angular stomatitis, cheilosis (swollen, cracked lips), hair loss, reproductive problems, sore throat, itchy and red eyes, and degeneration of the liver and nervous system; if severe and prolonged, anemia and cataracts can develop. — per the NIH Office of Dietary Supplements.

Foods that are particularly rich in riboflavin include eggs, organ meats (kidneys and liver), lean meats, and milk; some vegetables also contain riboflavin, and grains and cereals are fortified with riboflavin in the United States and many other countries. The largest dietary contributors of total riboflavin intake in U.S. men and women are milk and milk drinks, bread and bread products, mixed foods whose main ingredient is meat, ready-to-eat cereals, and mixed foods whose main ingredient is grain. (Among selected foods, pan-fried beef liver is especially high, at 2.9 mg per 3-ounce serving.) — per the NIH Office of Dietary Supplements.