Vitamin B2
Riboflavin
TL;DR
Riboflavin deficiency is rare in fortified-grain countries, but 400 mg/day — hundreds of times the RDA — has repeated randomized support for reducing migraine frequency.
Ideal For
- People with frequent migraine seeking a low-risk preventive
- Those with MTHFR TT genotype and elevated homocysteine
Avoid If
- Expecting a general energy boost — that only follows from correcting true deficiency
Frequently Asked Questions
What does vitamin B2 do?
Does it prevent migraine?
What dose is standard otherwise?
Is high-dose riboflavin safe?
Who is at risk of low levels?
Does it interact with medicines?
Overview
Riboflavin is the backbone of FAD and FMN, the flavin coenzymes that shuttle electrons through complexes I and II of the mitochondrial respiratory chain and regenerate glutathione via glutathione reductase. Ordinary nutritional deficiency is uncommon where grains are fortified, and when it occurs it shows up as angular cheilitis, sore tongue and normocytic anemia rather than the vague fatigue supplement marketing suggests. The interesting use is pharmacological. Migraine is associated with a subtle deficit in mitochondrial energy reserve, and 400 mg/day of riboflavin — roughly 300 times the RDA — has been tested as a way to raise flavin availability in that setting. It is also the required cofactor for MTHFR, which is why riboflavin status modulates homocysteine and blood pressure in people carrying the TT genotype. Riboflavin is water-soluble with no established toxicity; the main practical effect of high doses is bright fluorescent-yellow urine.
How It Works
- Precursor to FAD and FMN, cofactors in mitochondrial complexes I and II
- Regenerates reduced glutathione through glutathione reductase
- Required cofactor for MTHFR, influencing homocysteine metabolism
Quick Facts
- Migraine trials use 400 mg/day — about 300x the RDA
- No established upper limit; excess is excreted in urine
- Turns urine bright yellow, which makes blinding trials difficult
Health Concerns Addressed
Migraine Disorder
Adult evidence is reasonably consistent and the safety profile is close to unbeatable, but pediatric trials were negative and blinding is compromised by yellow urine.
Riboflavin Deficiency
Direct replacement therapy — supplementation reliably corrects the deficiency it treats.
MTHFR Mutation
Consistent, genotype-specific benefits in TT carriers from four RCTs, but all from one research group and judged very low certainty by Cochrane.
Elevated Blood Pressure
Positive only in the MTHFR 677TT subgroup, from one research group; a Cochrane review judges the overall evidence very low certainty.
Supporting Research28 studies
Comparison between Acupuncture and Nutraceutical Treatment with Migratens in Patients with Fibromyalgia Syndrome
Schweiger V
In 55 patients with fibromyalgia, both acupuncture and the nutraceutical Migratens (containing coenzyme Q10, magnesium, riboflavin and related nutrients) over 12 weeks reduced pain, fatigue and Fibromyalgia Impact Questionnaire scores versus baseline, with acupuncture producing faster relief and comparable outcomes at study end.
Riboflavin supplements for blood pressure lowering in adults
Bradbury KE, Coffey S, Earle N +2 more
The evidence for the effect of oral riboflavin supplements on systolic and diastolic blood pressure is very uncertain
Riboflavin lowers homocysteine in individuals homozygous for the MTHFR 677C->T polymorphism
McNulty H, Dowey le RC, Strain JJ +4 more
homocysteine responded only in the TT group
Impact of the common MTHFR 677C→T polymorphism on blood pressure in adulthood and role of riboflavin in modifying the genetic risk of hypertension: evidence from the JINGO project
Ward M, Hughes CF, Strain JJ +4 more
better riboflavin status is associated with a reduced genetic risk
Riboflavin offers a targeted strategy for managing hypertension in patients with the MTHFR 677TT genotype: a 4-y follow-up
Wilson CP, Ward M, McNulty H +4 more
Optimizing riboflavin status offers a low-cost targeted strategy
Inverse Association Between Riboflavin Intake and New-Onset Hypertension: A Nationwide Cohort Study in China
Liu M, Zhou C, Zhang Z +4 more
there was an inverse association between riboflavin intake and new-onset hypertension in general Chinese adults
Effect of riboflavin supplementation on plasma homocysteine in elderly people with low riboflavin status
McKinley MC, McNulty H, McPartlin J +2 more
it did not prove to be an effective homocysteine-lowering agent
Impact of the MTHFR C677T polymorphism on one-carbon metabolites: Evidence from a randomised trial of riboflavin supplementation
Rooney M, Bottiglieri T, Wasek-Patterson B +4 more
SAM (P = 0.008) and cystathionine (P = 0.045) concentrations increased
Riboflavin status modifies the effects of methylenetetrahydrofolate reductase (MTHFR) and methionine synthase reductase (MTRR) polymorphisms on homocysteine
García-Minguillán CJ, Fernandez-Ballart JD, Ceruelo S +4 more
This effect was eliminated when riboflavin status was optimal
Effect of vitamin B2, vitamin C, vitamin D, vitamin E and folic acid in adults with essential hypertension: a systematic review and network meta-analysis
Qi S, Luo X, Liu S +3 more
Among the five vitamins, only vitamin E was significantly more effective at reducing SBP
The relationship between riboflavin and hypertension with MTHFR C677T in older adults in northern China: a case-control study
Zhang L, Wang Z, Wu T +4 more
riboflavin concentration was negatively associated with the prevalence of hypertension
Riboflavin intake and 5-year blood pressure change in Chinese adults: interaction with hypertensive medication
Shi Z, Yuan B, Taylor AW +4 more
a higher riboflavin intake was inversely associated with change in systolic blood pressure
DNA methylation of hypertension-related genes and effect of riboflavin supplementation in adults stratified by genotype for the MTHFR C677T polymorphism
Amenyah SD, Ward M, McMahon A +4 more
riboflavin alters DNA methylation of hypertension-related genes in adults with the MTHFR 677TT genotype
Association between dietary thiamin, riboflavin and niacin intake and hypertension and increased pulse pressure: A cross-sectional study of the National Health and Nutrition Examination Survey 1999-2023
Ma S, Jin Q, Yu K +3 more
riboflavin may be inversely associated with pulse pressure
Effectiveness of high-dose riboflavin in migraine prophylaxis: a randomized controlled trial
Schoenen J, Jacquy J, Lenaerts M
Riboflavin was superior to placebo, with 59% versus 15% of patients achieving at least a 50% reduction in attacks.
Causes and Clinical Sequelae of Riboflavin Deficiency
McNulty H, Pentieva K, Ward M
There are adverse health consequences of low and deficient riboflavin status throughout the life cycle, including anemia and hypertension.
Effects of selected dietary supplements on migraine prophylaxis: A systematic review and dose-response meta-analysis of randomized controlled trials
Talandashti MK, Shahinfar H, Delgarm P +1 more
Magnesium supplementation reduced migraine attacks (mean difference (MD) = -2.51), severity (MD = -0.88), and the monthly migraine days (MD = -1.66) compared with the control group.
Improvement of migraine symptoms with a proprietary supplement containing riboflavin, magnesium and Q10: a randomized, placebo-controlled, double-blind, multicenter trial
Gaul C, Diener HC
Migraine days decreased more with the riboflavin, magnesium and coenzyme Q10 combination than placebo, though the primary endpoint was not met
Correcting a marginal riboflavin deficiency improves hematologic status in young women in the United Kingdom (RIBOFEM)
Powers HJ
Moderately poor riboflavin status can affect iron status: the lower the riboflavin status, the greater the hematologic benefits of improving status.
Vitamins and Minerals for Migraine Prophylaxis: A Systematic Review and Meta-analysis
Okoli GN, Rabbani R, Kashani HH
Pooled estimates favoured riboflavin for reducing migraine days, with low to moderate certainty of evidence.
Prophylaxis of migraine headaches with riboflavin: a systematic review
Thompson DF, Saluja HS
Adult trials generally showed reduced attack frequency at 400 mg daily, whereas paediatric trials were largely negative.
Blood pressure in treated hypertensive individuals with the MTHFR 677TT genotype is responsive to intervention with riboflavin: findings of a targeted randomized trial
Wilson CP
Riboflavin supplementation targeted at hypertensive individuals with the MTHFR 677TT genotype can decrease BP more effectively than treatment with current antihypertensive drugs only.
Riboflavin lowers blood pressure in cardiovascular disease patients homozygous for the 677C-->T polymorphism in MTHFR
Horigan G
Riboflavin is effective in reducing blood pressure specifically in patients with the MTHFR 677 TT genotype.
High-dose riboflavin for migraine prophylaxis in children: a double-blind, randomized, placebo-controlled trial
MacLennan SC, Wade FM, Forrest KML +3 more
Riboflavin 200 mg daily produced no significant difference from placebo in children with migraine.
Effect of Vitamin B2 supplementation on migraine prophylaxis: a systematic review and meta-analysis
Chen YS
Vitamin B2 400 mg/day for three months supplementation had significant effect on days, duration, frequency, and pain score of migraine attacks.
Prophylactic effect of riboflavin on pediatric migraine: a randomized, double-blind, placebo-controlled trial
Talebian A, Soltani B, Banafshe HR +1 more
There was a significant decrease of migraine frequency (p=0.000) and mean duration (p=0.000) in the high-dose group compared with the placebo group.
Riboflavin has neuroprotective potential: focus on Parkinson disease and migraine
Marashly ET, Bohlega SA
Riboflavin deficiency impairs mitochondrial electron transport, providing a plausible basis for benefit in migraine.
High-dose riboflavin treatment is efficacious in migraine prophylaxis: an open study in a tertiary care centre
Boehnke C, Reuter U, Flach U +3 more
Mean headache frequency fell from four to two attacks per month during open-label high-dose riboflavin.
Safety Information
Potential Side Effects
Bright yellow urine is universal at high doses and harmless. Occasional nausea or diarrhoea. No toxicity has been established even at gram doses.
Contraindications
None established. Photosensitizing in vitro but not clinically relevant.
Pregnancy & Breastfeeding
Pregnancy: Likely safe
Breastfeeding: Likely safe
Dosage Guidelines
Dosage Used in Studies
Consult healthcare provider
Best Time to Take
Morning with breakfast
Best Form
Plain riboflavin, 400 mg once daily
Bioavailability
Absorption is saturable — roughly 27 mg is absorbed per single dose, so very high doses are partly wasted
Dosing by Goal
| Goal | Dose | Notes |
|---|---|---|
| Typical | 400 mg/day for migraine prevention; 1.1-1.3 mg/day RDA for nutrition | Allow 3 months before judging migraine response; take with food |
Forms Compared
Riboflavin (free)
Form used in essentially all migraine trials; inexpensive
Riboflavin-5-phosphate
Marketed as pre-activated; no proven clinical advantage
Food & Timing
With a meal to reduce the small chance of nausea
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.