B-complex
Riboflavin B2 / pantothenic acid B5 / B-vitamin complex · Foundation
The remaining B vitamins, which are genuinely essential and almost never individually deficient on a normal diet.
What the evidence says
Riboflavin has a real, replicated finding for migraine prophylaxis at high dose — the best-supported claim in this group. Beyond that, supplementing B vitamins in people who are not deficient has not shown benefits for energy or mood, and the "B vitamins for energy" framing confuses their role in metabolising energy with providing it.
What studies used
Requirements are milligram-scale for each; retail complexes typically supply many multiples. Published studies had not established a preferred timing.
Reported from published studies and product labelling — a record of what was used in research, not a recommendation. What is right for you is a conversation with a clinician.
Watch out for
- Complexes usually carry B6, so they stack toward its neuropathy risk when taken alongside other products
- Riboflavin turns urine bright yellow — expected, not a problem
- Bright fatigue rarely turns out to be a B-vitamin problem; it is worth investigating rather than supplementing blindly
Evidence base
established literature
Strong human evidence: either a phase 3 or 4 trial report alongside review-level evidence, or ten or more randomised controlled trial reports.
This letter measures how much human research exists, not whether it works for you — the tier above (Limited) is the read on quality.
Research (12)
- Riboflavin: The Health Benefits of a Forgotten Natural VitaminInt J Mol Sci · 2020
- Effect of Vitamin B2 supplementation on migraine prophylaxis: a systematic review and meta-analysisNutr Neurosci · 2022
- Supplementation with Riboflavin (Vitamin B2) for Migraine Prophylaxis in Adults and Children: A ReviewInt J Vitam Nutr Res · 2015
- Corneal Cross-Linking: Epi-OnCornea · 2022
- Maternal B-vitamin and vitamin D status before, during, and after pregnancy and the influence of supplementation preconception and during pregnancy: Prespecified secondary analysis of the NiPPeR double-blind randomized controlled trialPLoS Med · 2023
- Impact of Vitamin B1 and Vitamin B2 Supplementation on Anxiety, Stress, and Sleep Quality: A Randomized, Double-Blind, Placebo-Controlled TrialNutrients · 2025
- Improvement of migraine symptoms with a proprietary supplement containing riboflavin, magnesium and Q10: a randomized, placebo-controlled, double-blind, multicenter trialJ Headache Pain · 2015
- Riboflavin status, MTHFR genotype and blood pressure: current evidence and implications for personalised nutritionProc Nutr Soc · 2016
- Intake and status of folate and related B-vitamins: considerations and challenges in achieving optimal statusBr J Nutr · 2008
- Circulating B vitamins metabolites in depressive disorders - connections with the microbiota-gut-brain axisBehav Brain Res · 2024
- B vitamins and berries and age-related neurodegenerative disordersEvid Rep Technol Assess (Full Rep) · 2006
- CoEnzyme Q10 and riboflavin: the mitochondrial connectionHeadache · 2012
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