Vitamin

Vitamin B2 (Riboflavin)

Also known as: Riboflavin, Riboflavin-5-phosphate, R5P, B2

Evidence

Essential B vitamin involved in energy production, antioxidant function, and metabolism of other B vitamins. The active form (R5P) is preferred.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

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Daily target & upper limit

1.3 mg / day

Vitamin B2 (Riboflavin) has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:

Vitamin B2 (Riboflavin) dosage reference →

Primary uses

Energy production
Migraine prevention
Antioxidant support
B-vitamin metabolism

How it works

Precursor to FAD and FMN coenzymes
Required for electron transport chain
Regenerates glutathione (antioxidant)
Required for folate and B6 activation

Dosage

Typical range: 10-400 mg daily (400mg for migraines)
Timing: With food
With food: Yes, improves absorption
Duration: Safe for long-term use
Special populations: Migraine sufferers may need higher doses

Forms

Riboflavin-5-phosphate (R5P)
Riboflavin

Safety

Common side effects

Bright yellow urine (harmless)
Very well tolerated

Contraindications

None known

Products containing Vitamin B2 (Riboflavin)

Top-scoring supplements in our catalog that list Vitamin B2 (Riboflavin) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

Thorne

Craving and Stress Support

Evidence notes

Well-established essential nutrient, good evidence for migraine prevention

Grade A: Multiple well-designed human trials support the main claims.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.