High Quality Vitamin B2 (Riboflavin) Supplements

Riboflavin (B2) is a cofactor for energy production, glutathione recycling, and methylation pathways. It's well-studied for migraine prevention — 400 mg/day reduces migraine frequency by about half in clinical trials.

Yes — bright fluorescent yellow. It's harmless and indicates the vitamin is being absorbed and excreted. The intensity decreases as your body's stores are saturated.

RDA is 1.1–1.3 mg/day. Migraine prevention studies use 400 mg/day for at least 3 months. The active form (riboflavin-5-phosphate) bypasses conversion steps and works at lower doses for people with riboflavin metabolism issues.

Effects build slowly — most people see migraine frequency drop after 2–3 months of consistent 400 mg/day dosing. If you don't see benefit by 4 months, riboflavin probably isn't going to help you. It's well-tolerated to use long-term if it works.

Riboflavin needs to be converted to its active forms (FMN and FAD) in the body. Riboflavin-5-phosphate (R5P) is one of the active forms, bypassing this conversion. People with thyroid issues, methylation issues, or B2 conversion problems benefit from R5P at lower doses.

Liver, dairy products (milk, yogurt, cheese), eggs, almonds, mushrooms, and fortified cereals. Riboflavin is sensitive to light — milk in clear bottles loses riboflavin quickly. Most people get adequate B2 from a varied diet.

Vegans (limited dietary sources), heavy alcohol users, people with malabsorption, and those with hypothyroidism. Symptoms include cracked lips, mouth sores, sore throat, and light sensitivity. Severe deficiency is uncommon in developed countries.

Yes — riboflavin is needed for iron metabolism. Deficiency can contribute to anemia even with adequate iron intake. People with treatment-resistant anemia sometimes benefit from adding B2 alongside iron, especially if they have an MTHFR variant or take metformin.

Bright yellow urine is normal and harmless. Rare reactions include diarrhea or itching. Riboflavin is water-soluble and well-tolerated. There's no established upper limit because excess is excreted in urine.