◂ Library/Essential Vitamin
Essential Vitamin⚜ Compound

Riboflavin

01 / OVERVIEW

What this compound does

WHAT IT DOES

Riboflavin, also called vitamin B2, helps your body turn food into energy. It's important for keeping your skin, eyes, and nervous system healthy. Your body uses it to make two helpers that are crucial for many chemical reactions, especially those that release energy from carbohydrates, fats, and proteins. You can get it from foods like milk, eggs, meat, and green vegetables. Most people get enough from their diet, but some conditions or medications may increase the need.

KEY BENEFITS
Supports steady energy production from food
Helps maintain healthy skin and vision
May reduce the frequency of migraine headaches
Aids in the metabolism of iron and other vitamins
Protects cells from oxidative stress
BEST FOR
  • • People with frequent migraines (especially those with a low riboflavin intake)
  • • Individuals with poor energy or fatigue related to B2 deficiency
  • • Those with certain eye conditions like cataracts (as part of prevention)
  • • Pregnant or breastfeeding women to meet increased needs
WHAT TO EXPECT

When taking riboflavin for migraines, effects may take 3-4 weeks to become noticeable. You might see a bright yellow color in your urine, which is harmless. Energy benefits, if deficient, can appear within a few days to weeks.

WHO SHOULD AVOID THIS
  • • There are no specific groups that need to avoid riboflavin; it is considered safe at typical intakes
  • • People with a known allergy to riboflavin (very rare)
  • • Those taking high doses under medical supervision (generally safe, but urine will turn bright yellow)
MYTHS & FACTS
Myth: Riboflavin makes your urine turn yellow because it's not absorbed.
Fact: The bright yellow color is due to the vitamin being excreted unchanged; it's a normal and harmless sign that the body has enough.
Myth: Taking extra riboflavin always boosts energy.
Fact: Only people with a deficiency will notice an energy boost; in people with adequate levels, extra riboflavin is simply excreted.
Myth: Riboflavin can cure migraines completely.
Fact: High-dose riboflavin may reduce migraine frequency and severity, but it does not work for everyone and is not a cure.
✦ Card Stats
DOSE
25-100 mg/day for general supplementation and energy support
Evidence
—
Studies indexed6
How it's made

Production details below.

03 / DOSAGE

How much, when

MAINTENANCE

25-100 mg/day for general supplementation and energy support

Take with meals for improved absorption and to minimize GI upset; split into 2 doses if well-tolerated

TIMING

Riboflavin — Morning dose

Take with food (high-carbohydrate meal)

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 27619756

    Migraine prevention

    A 400 mg/day dose of riboflavin reduced migraine frequency by 2-3 headaches per month in a 3-month RCT (n=55). Similar results in a meta-analysis of 8 trials.

    A
  • PMID: 23524517

    Eye health

    Higher dietary riboflavin intake was associated with a 20-30% lower risk of cataracts in a cohort study (n=3,000+).

    B
  • PMID: 1749098

    Iron absorption

    Riboflavin supplementation improved iron absorption and hemoglobin levels in iron-deficient women (RCT, n=100, 2 months).

    B
  • PMID: 8450712

    Energy metabolism

    In riboflavin-deficient individuals, supplementation restored metabolic rate and reduced fatigue within 1-2 weeks (observational, n=30).

    C
  • PMID: 25982113

    Blood pressure

    Riboflavin supplementation (1.6 mg/day) lowered systolic BP by 6 mmHg in patients with MTHFR 677TT genotype (RCT, n=162, 4 months).

    A
  • PMID: 10719842

    Cervical cancer risk

    Low riboflavin status was associated with a 2-fold increased risk of cervical dysplasia in a case-control study (n=400).

    C
  • PMID 33779525 · 2022Meta-Analysis

    Effect of Vitamin B2 supplementation on migraine prophylaxis: a systematic review and meta-analysis

    B
  • PMID 40005035 · 2025RCT

    Evaluating the Efficacy of Probiotics on Disease Progression, Quality of Life, and Nutritional Status Among Patients with Crohn's Disease: A Multicenter, Randomized, Single-Blinded Controlled Trial

    B
  • PMID 40507089 · 2025RCT

    Impact of Vitamin B1 and Vitamin B2 Supplementation on Anxiety, Stress, and Sleep Quality: A Randomized, Double-Blind, Placebo-Controlled Trial

    B
  • PMID 32428983 · 2020Meta-Analysis

    Dietary interventions for multiple sclerosis-related outcomes

    B
  • PMID 31915511 · 2019Pharmacokinetic Study

    A Randomized Pilot Trial to Evaluate the Bioavailability of Natural versus Synthetic Vitamin B Complexes in Healthy Humans and Their Effects on Homocysteine, Oxidative Stress, and Antioxidant Levels

    B
04 / INTERACTIONS

Medicine interactions

  • Tricyclic antidepressants (e.g., amitriptyline)· antidepressant

    May inhibit riboflavin absorption.

    → Monitor riboflavin status with long-term use; consider supplementation if deficiency is suspected.

    MODERATE

  • Probenecid· urate_lowering

    Probenecid decreases renal excretion of riboflavin, increasing blood levels.

    → Avoid high-dose riboflavin supplements to prevent excessive accumulation.

    MODERATE

  • Phenobarbital· barbiturate

    May accelerate riboflavin metabolism, potentially increasing requirements.

    → Ensure adequate dietary intake; supplementation not routinely needed.

    LOW

  • Oral contraceptives· contraceptive

    May reduce riboflavin levels in some studies.

    → Maintain a balanced diet; supplementation if deficiency symptoms arise.

    LOW

  • Chlorpromazine· antipsychotic

    May interfere with riboflavin absorption or utilization.

    → Monitor for deficiency signs; supplement if needed.

    LOW

This page is a reference summary, not a prescription. Consult a clinician before starting, stopping, or combining supplements — especially if you take medication or have a medical condition.