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Riboflavin

AEMPS

Water-soluble vitamin B2

ATC code: A11HA04

Brand names: Vitamin B2

Updated · Methodology

Indications

B

Migraine prophylaxis

Adjunct

Riboflavin 400 mg/day received Level B (probably effective) in the 2012 /AHS guideline for episodic migraine prevention. Meta-analyses show 1.5–2.5 fewer attacks per month after 3 months of treatment. SEN 2020 lists riboflavin as an option when beta-blockers, topiramate and CGRP antagonists are contraindicated – particularly for patients preferring «natural» therapy and adolescents where topiramate is restricted. Cochrane 2015 acknowledges the positive signal with a favourable safety profile but calls for larger trials. Paediatric data are limited; dose is weight-adjusted. Effect develops slowly – assess at 3 months of uninterrupted use.

Sources

  1. AAN/AHS: Evidence-based guideline update: NSAIDs and other complementary treatments for episodic migraine prevention in adults (2012)
  2. Cochrane: Riboflavin for migraine prevention (2015)

ICD-10: G43.9 · ICD-11: 8A80.Z

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

D

Fatigue and low energy (supplement marketing)

Not recommended

Riboflavin is vitamin B2. Supplements market it "for energy" and against fatigue, pointing to the vitamin's part in metabolism. In people without a B2 deficiency, riboflavin has shown no clear benefit for tiredness or low energy, and there is no evidence base behind this use. Lasting fatigue usually traces back to poor sleep, anemia, thyroid problems or depression, so finding the cause with a doctor helps more than a vitamin. Riboflavin is harmless in this role, but do not take it instead of treatment with proven benefit, or you may miss the real reason for the fatigue

Sources

  1. Cochrane: Riboflavin for migraine prevention (2015)

ICD-10: R53 · ICD-11: MG22

How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Riboflavin is converted intracellularly to flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). These coenzymes participate in oxidative phosphorylation, the Krebs cycle, fatty acid and amino acid metabolism. FAD is required for glutathione synthesis and vitamin K regeneration. The drug colours urine bright yellow as an absorption marker. Body stores are small; daily need 1.1–1.3 mg.

Safety

Contraindications

  • Hypersensitivity to riboflavin (very rare)

Serious adverse effects

  • Not reported with oral physiological and therapeutic doses

Common adverse effects

  • Bright-yellow urine discolouration (pharmacological feature, not pathology)
  • Transient diarrhoea at high doses
  • Polyuria

Pregnancy: can you take Riboflavin?

FDA Category A. Riboflavin is required in pregnancy; recommended daily intake 1.4 mg. Migraine-prophylaxis doses (400 mg/day) in pregnancy are poorly studied; AEMPS recommends discussion with a neurologist and a preference for beta-blockers or non-pharmacological measures.

Breastfeeding: can you take Riboflavin?

Compatible. Hale L1. Riboflavin passes into breast milk; infant levels reflect maternal diet. Physiological and prophylactic doses are safe.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

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Frequently asked

What is Riboflavin used for?

Riboflavin is evaluated for the following indications with varying evidence strength: Migraine prophylaxis (evidence tier B), Fatigue and low energy (supplement marketing) (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Riboflavin?

Common side effects of Riboflavin (≥ 1 in 100): Bright-yellow urine discolouration (pharmacological feature, not pathology), Transient diarrhoea at high doses, Polyuria. See the Safety section for uncommon and serious reactions.

Is Riboflavin safe during pregnancy?

FDA Category A. Riboflavin is required in pregnancy; recommended daily intake 1.4 mg. Migraine-prophylaxis doses (400 mg/day) in pregnancy are poorly studied; AEMPS recommends discussion with a neurologist and a preference for beta-blockers or non-pharmacological measures.

Is Riboflavin compatible with breastfeeding?

Compatible. Hale L1. Riboflavin passes into breast milk; infant levels reflect maternal diet. Physiological and prophylactic doses are safe.

Who should not take Riboflavin?

Riboflavin is contraindicated in: Hypersensitivity to riboflavin (very rare). Full list in the Safety section.

Official sources

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