People mainly take Vitamin B2 for libido, focus, anxiety. Based on 9 first-hand reports and 19 meta-analyses & systematic reviews in the medical literature. Ranked #703 of 1,974 overall.
Of reports that state an outcome, 100% are positive.
Of the people who reported each effect, the share who said it got better.
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: A pooled analysis of available randomized controlled clinical trials demonstrated that Vitamin B2 400 mg/day for three months supplementation had significant effect on days, duration, frequency, and pain score of migraine attacks.
PubMed 33779525 ↗Conclusion: Raw milk consumption was not associated with cancer (two studies) or lactose intolerance (one study). Overall, these findings should be interpreted with caution given the poor quality of reported methodology in many of the included studies.
PubMed 22054181 ↗Conclusion: The certainty of evidence for the meta-analyses was low (n = 2) or very low (n = 46). Overall, the available evidence points to both risks and benefits associated with a vegan diet among children, although more and better designed studies are needed.
PubMed 37811643 ↗Conclusion: The evidence for the use of CXL in the management of keratoconus is limited due the lack of properly conducted RCTs.
PubMed 25803325 ↗As stated by users — not a recommendation. Follow the label or your doctor.
How often each side effect came up across all reports.
Verbatim quotes, shortened only — each links to the original discussion.
“Vitamin B2 5mg”
“The B-Complex mentioned above includes only the active R-5-P form at 10mg”
“Vitamin B2 needs vitamin B6 to be converted into coenzyme B2”
“Deadlifts, squats, creatine and B2 believe it or not.”
“Vitamin B2 is essential for B3 (NAD) production.”
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate