What does the evidence show about Vitamin B2 (riboflavin)'s effects?

Read Off Label rates the evidence for Vitamin B2 (riboflavin) as Strong and the benefit magnitude as moderate, producing an overall grade of A (8.0/10). Schoenen 1998 and follow-up studies report migraine-prevention effects at 400 mg/day with generally favourable tolerability.

What safety findings are reported for Vitamin B2 (riboflavin)?

Vitamin B2 (riboflavin) has a low risk profile in the database. Low (bright yellow urine; no known toxicity) Legal status: OTC.

What doses or routes are reported for Vitamin B2 (riboflavin)?

1.1-1.3 mg/day RDA; 400 mg/day for migraine prophylaxis (3 months trial) This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.

Rankings / Essentials — Vitamins & Minerals

Vitamin B2 (riboflavin)

Essentials · Vitamin

Tier A

Reviewed by Read Off Label · Last reviewed Jun 8, 2026 · How we grade

vitaminmitochondrialotc

8 / 10

Tier A

Ev 8 Bn 5 Sf 9

Bottom line

Read Off Label grades Vitamin B2 (riboflavin) as A (8.0/10) based on strong evidence, moderate benefit magnitude, and a low-risk safety profile.

Schoenen 1998 and follow-up studies report migraine-prevention effects at 400 mg/day with generally favourable tolerability.

Studied, labeled, or reported-use context: 1. — OTC; not individualized guidance.

What the evidence says

Schoenen 1998 and follow-up studies report migraine-prevention effects at 400 mg/day with generally favourable tolerability. Glutathione recycling depends on FAD, so deficiency compounds oxidative stress. Photodegradation occurs with light exposure.

Mechanism

Precursor to FAD and FMN — essential cofactors for the electron transport chain (complexes I and II), beta-oxidation, glutathione reductase, and the folate/methionine cycle

Studied, labeled, or reported dose & route

1.1-1.3 mg/day RDA; 400 mg/day for migraine prophylaxis (3 months trial)

This records doses and routes described in studies, approved labeling, clinical practice, or documented use. It is not individualized guidance and does not establish safety; context changes with indication, formulation, health history, monitoring, and other medicines.

Citations

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Common questions

What does the evidence show about Vitamin B2 (riboflavin)'s effects?: Read Off Label rates the evidence for Vitamin B2 (riboflavin) as Strong and the benefit magnitude as moderate, producing an overall grade of A (8.0/10). Schoenen 1998 and follow-up studies report migraine-prevention effects at 400 mg/day with generally favourable tolerability.
What safety findings are reported for Vitamin B2 (riboflavin)?: Vitamin B2 (riboflavin) has a low risk profile in the database. Low (bright yellow urine; no known toxicity) Legal status: OTC.
What doses or routes are reported for Vitamin B2 (riboflavin)?: 1.1-1.3 mg/day RDA; 400 mg/day for migraine prophylaxis (3 months trial) This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.
How does Vitamin B2 (riboflavin) work?: Precursor to FAD and FMN — essential cofactors for the electron transport chain (complexes I and II), beta-oxidation, glutathione reductase, and the folate/methionine cycle

This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.