Vitamin B2 (Riboflavin)
Vitamin2 forms compared ↓
Also known as: Riboflavin, Riboflavin-5-phosphate, R5P, B2
A
Grade A💊 10-400 mg daily (400mg for migraines)🎯 4 primary uses🔗 3 synergies⚠️ Review warnings
Levels upNutrition+50 pts
Overview
Essential B vitamin involved in energy production, antioxidant function, and metabolism of other B vitamins. The active form (R5P) is preferred.
Primary Uses
Energy productionMigraine preventionAntioxidant supportB-vitamin metabolism
Frequently Asked About Vitamin B2 (Riboflavin)
How much Vitamin B2 (Riboflavin) should I take?
The typical effective range is 100 mg. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take Vitamin B2 (Riboflavin)?
With food. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take Vitamin B2 (Riboflavin) with food?
Yes, improves absorption.
What is the best form of Vitamin B2 (Riboflavin)?
Riboflavin-5-Phosphate (R5P) is generally the best-absorbed form (Active coenzyme form of riboflavin). Cheaper forms exist but often deliver less usable Vitamin B2 (Riboflavin) per dose.
Does Vitamin B2 (Riboflavin) interact with medications?
Yes — known interactions include None significant. If you take any prescription medication, talk to your doctor or pharmacist before starting Vitamin B2 (Riboflavin).
What does Vitamin B2 (Riboflavin) pair well with?
Vitamin B2 (Riboflavin) stacks well with B-complex, Magnesium (for migraines), and CoQ10 — these combinations either improve absorption or work synergistically toward common goals.
Who should not take Vitamin B2 (Riboflavin)?
Vitamin B2 (Riboflavin) should be avoided or used with caution by people with None known. Pregnant or breastfeeding women should consult a healthcare provider before use.
Compare Forms
2 formsDifferent chemical forms vary in absorption, side effects, and best use cases. Higher bioavailability scores indicate better absorption.
Riboflavin-5-Phosphate (R5P)
HIGH 100Active coenzyme form of riboflavin
Best for:MigrainesEnergy productionThose with conversion issues
💡 Excellent. Already active - no conversion needed.
✅ Pros
- • Active form
- • Better for migraines
- • No conversion needed
⚠️ Cons
- • More expensive
- • Less stable
📝 Best choice, especially for migraine prevention
Riboflavin
GOOD 80Standard B2 form
Best for:General supplementationBudget option
💡 Good, requires conversion to R5P
✅ Pros
- • Inexpensive
- • Widely available
- • Well-studied
⚠️ Cons
- • Requires conversion
- • May cause bright yellow urine
📝 Yellow urine is normal and harmless
Dosage
Typical range
10-400 mg daily (400mg for migraines)
Timing
With food
With food
Yes, improves absorption
Dose Tiers
RDA / DV
1.1-1.3 mg
Moderate
10-50 mg
Optimal
100 mg
Therapeutic
400 mg
Upper Limit
No established UL
Duration
Safe for long-term use
Special Populations
Migraine sufferers may need higher doses
Research & Studies
Search the literature now
We haven’t curated landmark studies for Vitamin B2 (Riboflavin)yet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Search Vitamin B2 (Riboflavin) research
Mechanism of Action
- • Precursor to FAD and FMN coenzymes
- • Required for electron transport chain
- • Regenerates glutathione (antioxidant)
- • Required for folate and B6 activation
Evidence Quality
Evidence Grade A
Well-established essential nutrient, good evidence for migraine prevention
Safety & Contraindications
Serious Warnings
- • None
Contraindications
- • None known
Common Side Effects
- • Bright yellow urine (harmless)
- • Very well tolerated
Pregnancy & Breastfeeding
Likely safe at normal doses - consult provider
Liver & Kidney Notes
Safe
Interactions
💊 Medications
- • None significant
🧪 Supplements
- • Synergistic with B-complex
🍽️ Food & Alcohol
- • Alcohol increases need
Stacking & Synergies
Pairs Well With
Best Goal Synergies
Migraine preventionEnergy
Buying Guide
What to Look For
- • R5P form preferred
- • Adequate dose for goal
Standardization Markers
mg content
Adulteration risk
Low
Practical Notes
- • Yellow urine is normal and harmless
- • 400mg daily for migraine prevention
- • Take 2-3 months for migraine effect
Tags
water-solubleenergyantioxidantmigraine
Top Products with Vitamin B2 (Riboflavin)
Highest-scored catalog products containing Vitamin B2 (Riboflavin), ranked by our scoring engine.
Craving and Stress SupportThorne96
MediClear-SGS™ - VanillaThorne95
Methyl-Guard Plus®Thorne95
Basic Nutrients 2/DayThorne93
More in Vitamin
Other ingredients in the Vitamin category.
B-Complex (Energy Focus)
Essential coenzymes for energy metabolism. Methylated forms for optimal function.
Benfotiamine
Fat-soluble thiamine derivative with superior bioavailability. Particularly effective for diabetic neuropathy and AGE reduction.
Beta-Carotene
Provitamin A carotenoid converted to retinol as needed. Cannot cause toxicity. Provides independent antioxidant benefits.
Folate
Essential B vitamin for DNA synthesis, cell division, and methylation. Critical during pregnancy.
Methylfolate
Active form of folate for those with MTHFR variants. Critical for methylation and mood.
Multivitamin (Athletic Formula)
Broad-spectrum insurance for micronutrient gaps. Athletes may need more than RDA.
Last reviewed: August 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, August). Vitamin B2 (Riboflavin) — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/vitamin-b2
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.