Does Vitamin B2 (riboflavin) work?

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 RCT and follow-ups support 400 mg/day for migraine prevention — a cheap, well-tolerated first-line addition.

Is Vitamin B2 (riboflavin) safe?

Vitamin B2 (riboflavin) has a low risk profile in published human data. Legal status: OTC. This is not medical advice — see the disclaimer.

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 RCT and follow-ups support 400 mg/day for migraine prevention — a cheap, well-tolerated first-line addition.

Typical use: 1. — OTC.

What this is

Schoenen 1998 RCT and follow-ups support 400 mg/day for migraine prevention — a cheap, well-tolerated first-line addition. Glutathione recycling depends on FAD, so deficiency compounds oxidative stress. Photodegrades — store away from light.

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

Dose & route

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

Citations

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Common questions

Does Vitamin B2 (riboflavin) work?: 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 RCT and follow-ups support 400 mg/day for migraine prevention — a cheap, well-tolerated first-line addition.
Is Vitamin B2 (riboflavin) safe?: Vitamin B2 (riboflavin) has a low risk profile in published human data. Legal status: OTC. This is not medical advice — see the disclaimer.
What is the typical dose for Vitamin B2 (riboflavin)?: 1.1-1.3 mg/day RDA; 400 mg/day for migraine prophylaxis (3 months trial)
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.