vitaminNot FDA-approvedOTC supplementSold over the counter as a dietary supplement in the US; riboflavin is an FDA-recognized essential nutrient but is not itself an FDA-approved migraine drugThe meta-analyses report benefit for migraine prophylaxis at high (400 mg/day) doses but note variable trial quality and small sample sizes
Vitamin B2 (Riboflavin)Benefits, Dosage & Interactions
Also known as: Riboflavin, B2
Vitamin B2, also known as riboflavin, is an essential water-soluble vitamin that plays a crucial role in maintaining human health. Research on Vitamin B2 (Riboflavin) focuses on mitochondrial function. It is typically taken in the morning. Dose, response, and interaction risk vary by individual, so use should be reviewed with a clinician.
Researched by DoseRoutine R&D TeamReviewed for accuracy by Nicholas Alexander, RSELast updated
Evidence: Strong — 1 human randomized trial published.
PubMed:17240780
Evidence strengthStrong · 4/4
PreclinicalStrong human evidence
1 human randomized trial published.
Whole-body biological half-life
Not applicable
Typical timing
morning
Food rule
with food
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for Vitamin B2 (Riboflavin) in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Vitamin B2 (Riboflavin) entry is written from. Each number matches an inline marker above.
- [1]Supplementation with Riboflavin (Vitamin B2) for Migraine Prophylaxis in Adults and Children: A ReviewNamazi N, Heshmati J, Tarighat-Esfanjani A · International Journal for Vitamin and Nutrition Research · 2015 · Peer-reviewed · PMID 26780280
- [2]Effect of Vitamin B2 supplementation on migraine prophylaxis: a systematic review and meta-analysisChen YS, Lee HF, Tsai CH, Hsu YY, Fang CJ, Chen CJ · Nutritional Neuroscience · 2022 · Peer-reviewed · PMID 33779525
- [3]Improvement of migraine symptoms with a proprietary supplement containing riboflavin, magnesium and Q10: a randomized, placebo-controlled, double-blind, multicenter trialGaul C, Diener HC, Danesch U, Migravent Study Group · The Journal of Headache and Pain · 2015 · Peer-reviewed · PMID 25916335
How to track Vitamin B2 (Riboflavin) doses
Tracking Vitamin B2 (Riboflavin) well takes four fields and a habit. Here is what to record so the log is still useful in three months.
- 1
Add the dose and unit
Log Vitamin B2 (Riboflavin) with its dose in mg so totals stay comparable over time — including days when you split the dose or skip it.
- 2
Set the time of day and food rule
Typical timing is morning. Take it with food, and record it that way so absorption stays consistent. Reminders fire at that time and can export to your calendar.
- 3
Check it against the rest of the stack
Run Vitamin B2 (Riboflavin) through the interaction checker against everything else in the routine — supplements, peptides, hormones and prescriptions — before it becomes a daily habit.
- 4
Log adherence, not intentions
Mark each dose taken, skipped or delayed as it happens. Weeks of honest logs are what make an adherence rate or a trend line meaningful; retrospective guessing is not.
- 5
Review against outcomes
Review Vitamin B2 (Riboflavin) alongside your logged metrics and any relevant blood work every few weeks before changing the dose, so the change is a response to data rather than to a good or bad day.
What to log each time
- Dose in mg
- Time of day and whether it was taken with food
- Taken / skipped / delayed
- Any side effects or notable changes
References & Evidence
Sources on this page that document Vitamin B2 (Riboflavin) dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Vitamin B2 (Riboflavin) studied for?
Deficiency-driven — not a performance booster
Vitamins primarily help when you're actually low. Extra doses on top of normal levels rarely add strength, endurance, or fat loss, and some fat-soluble vitamins (A, D, E, K) can build up to harmful levels.
- Confirm a deficiency with bloodwork before supplementing long-term (e.g. 25(OH)D for vitamin D, B12/folate, ferritin, magnesium RBC).
- Talk to your doctor or a registered dietitian about the right dose for your labs, medications, and conditions — especially in pregnancy, kidney/liver disease, or while on blood thinners.
- Re-test every 3–6 months and stop or lower the dose once levels are in range.
Educational information only — not medical advice. See our AI & medical policy.
What is Vitamin B2 (Riboflavin)?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Vitamin B2, also known as riboflavin, is an essential water-soluble vitamin that plays a crucial role in maintaining human health. As a component of two major coenzymes, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), riboflavin is integral to a wide array of cellular processes, including energy production and metabolism of fats, carbohydrates, and proteins. It is also required for the proper function of other B vitamins, such as the conversion of B6 to its active form and the conversion of tryptophan to niacin (Vitamin B3). Riboflavin contributes to the maintenance of healthy skin, eyes, nerves, and red blood cells. Since it is water-soluble, the body does not store large amounts of riboflavin, and any excess is typically excreted in the urine, giving it a characteristic yellow-orange color. Therefore, a consistent dietary intake or supplementation is necessary. Riboflavin is naturally present in several foods, including milk, cheese, eggs, leafy green vegetables, lean meats, and fortified cereals (NIH Office of Dietary Supplements).
Why vitamins for muscle and endurance: Riboflavin is a cofactor in the electron transport chain and in fatty acid oxidation. Deficiency limits aerobic energy production and recovery; supplementation past sufficiency does not add benefit.
References: NIH ODS Riboflavin fact sheet (2022); Woolf K, Manore MM. B-vitamins and exercise. Int J Sport Nutr Exerc Metab. 2006;16(5):453-84.
What does the research say about Vitamin B2 (Riboflavin)?
Tap a section to expand.
Riboflavin's primary mechanism of action revolves around its conversion into two coenzymes: flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). This conversion occurs primarily in the small intestine, liver, and heart. Once formed, FMN and FAD act as electron carriers in numerous oxidation-reduction reactions, which are fundamental to energy metabolism.
* **Energy Production:** FAD is a critical component of the electron transport chain, a series of protein complexes embedded in the inner mitochondrial membrane that generates adenosine triphosphate (ATP), the body's main energy currency. FAD accepts electrons and protons during the Krebs cycle and fatty acid oxidation, delivering them to the electron transport chain. FMN also participates in certain enzymatic reactions within the mitochondria.
* **Macronutrient Metabolism:** These coenzymes are involved in the metabolism of carbohydrates, fats, and proteins. For instance, FAD is a cofactor for acyl-CoA dehydrogenase, an enzyme essential for beta-oxidation of fatty acids, and for pyruvate dehydrogenase, important for carbohydrate metabolism.
* **Antioxidant Support:** Riboflavin is indirectly involved in antioxidant defense. FAD is a cofactor for glutathione reductase, an enzyme that regenerates reduced glutathione, a key antioxidant, from its oxidized form. This contributes to protecting cells from oxidative damage.
* **Vitamin Interconversion:** Riboflavin is necessary for the activation of other vitamins. It helps convert vitamin B6 (pyridoxine) into its active coenzyme form, pyridoxal 5'-phosphate. It also assists in the conversion of tryptophan, an amino acid, into niacin (vitamin B3).
These multifaceted roles underscore riboflavin's importance in maintaining cellular function and overall physiological health (PubChem, DrugBank).
Source for this section: Sources for How does Vitamin B2 (Riboflavin) work?: Jumps to this entry in the sources and references list at the end of the page.
Riboflavin (Vitamin B2) offers several important health benefits due to its central role in metabolic processes and cellular function:
* **Energy Metabolism Support:** As a vital component of FAD and FMN, riboflavin is indispensable for the body's energy production. These coenzymes are crucial for the electron transport chain, which generates ATP from carbohydrates, fats, and proteins. Adequate riboflavin levels support efficient energy conversion and overall metabolic health (NIH Office of Dietary Supplements).
* **Mitochondrial Function:** Given its role in FAD and FMN, riboflavin directly supports mitochondrial health and function. Mitochondria are often called the 'powerhouses of the cell,' and riboflavin helps ensure their optimal operation in producing energy, which is critical for all bodily functions (Examine.com).
* **Red Blood Cell Formation and Function:** Riboflavin plays a part in the production of red blood cells, which are responsible for carrying oxygen throughout the body. It may also help prevent and treat certain types of anemia by enhancing iron absorption and utilization (MedlinePlus).
* **Antioxidant Protection:** While not a direct antioxidant, riboflavin contributes to the body's antioxidant defenses. FAD is a cofactor for glutathione reductase, an enzyme that regenerates glutathione, a powerful endogenous antioxidant. This indirectly aids in protecting cells from oxidative stress and free radical damage (PubChem).
* **Vision Health:** Riboflavin is important for maintaining good vision. Deficiency can lead to various eye disorders. Some research suggests that adequate riboflavin intake may play a role in preventing cataracts, although more robust evidence is needed to confirm this effect in humans (Mayo Clinic).
* **Migraine Headache Management:** Emerging research suggests that riboflavin supplementation, particularly at higher doses than typical dietary intake, may be effective in reducing the frequency and intensity of migraine headaches in some individuals. This effect is thought to be related to its role in mitochondrial energy metabolism (Cochrane Library).
* **Skin and Hair Health:** Due to its involvement in cell growth and maintenance, riboflavin contributes to healthy skin, hair, and nails. Deficiency can manifest as skin cracks, especially around the corners of the mouth (cheilosis) and nose (seborrheic dermatitis) (MedlinePlus).
Individual needs vary; talk to a licensed clinician.
Evidence for the benefits of Vitamin B2 (riboflavin) is primarily derived from observational studies, controlled trials, and its well-understood biochemical roles.
For its role in **energy metabolism and mitochondrial function**, the evidence is robust due to riboflavin's established biochemical function as a precursor to FAD and FMN, essential coenzymes in the electron transport chain. NIH Office of Dietary Supplements and PubChem both detail these foundational enzymatic roles.
Regarding **migraine headache management**, a Cochrane review concluded that riboflavin, commonly studied at 400 mg daily, is probably effective in reducing adult migraine attack frequency with few side effects. This evidence primarily comes from randomized controlled trials that have investigated its prophylactic use. While promising, individual responses vary.
Its contribution to **red blood cell formation and antioxidant processes** is supported by studies demonstrating its role in iron metabolism and as a cofactor for glutathione reductase. MedlinePlus highlights its importance in preventing anemia, particularly related to iron deficiency.
Evidence for **vision health**, specifically in relation to cataracts, is mixed. Some observational studies suggest an inverse association between riboflavin intake and cataract risk, but large-scale intervention trials have not consistently confirmed a strong protective effect. The Mayo Clinic notes its importance for general eye health but maintains a cautious stance on cataract prevention.
The essential nature of riboflavin for **basic cellular function, skin, and hair health** is clear from deficiency symptoms. Clinical manifestations of riboflavin deficiency (ariboflavinosis), such as cheilosis and angular stomatitis, are well-documented and resolve with riboflavin repletion, reinforcing its critical role in tissue maintenance (NIH Office of Dietary Supplements).
Riboflavin (Vitamin B2) is generally considered very safe, even at higher intakes, due to its water-soluble nature and rapid excretion. Adverse effects from dietary intake are extremely rare. When consumed in supplement form, particularly at high doses, some mild and transient side effects may occur:
* **Yellow or Orange Urine:** The most common and harmless side effect is a bright yellow or orange discoloration of the urine. This is simply due to the body excreting excess riboflavin and is not indicative of kidney damage or other health problems (NIH Office of Dietary Supplements).
* **Mild Digestive Upset:** Very high doses might occasionally lead to mild stomach upset, nausea, or diarrhea in sensitive individuals (Mayo Clinic).
* **Increased Urination:** Due to being water-soluble, higher doses may slightly increase urine output as the body flushes out the excess (MedlinePlus).
Serious adverse effects are extremely uncommon and generally only reported with excessively high, unphysiological doses. There is no established upper limit for riboflavin intake because of its low toxicity profile. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
While riboflavin (Vitamin B2) is generally very safe, certain considerations and warnings apply:
* **Urine Discoloration:** High doses of riboflavin will cause urine to turn a bright yellow or orange color. This is a harmless effect due to the excretion of excess vitamin and should not be a cause for alarm (NIH Office of Dietary Supplements).
* **Kidney Function:** Individuals with pre-existing severe kidney disease should exercise caution with very high doses of any water-soluble vitamins, including riboflavin, as their ability to excrete excess may be impaired. Consultation with a nephrologist or healthcare provider is advisable (Mayo Clinic).
* **Light Sensitivity:** Riboflavin is photosensitive and can be degraded by light. Therefore, supplements should be stored in opaque containers. Excessive light exposure can also degrade riboflavin in food (PubChem).
* **Interference with Lab Tests:** High intake of riboflavin may interfere with certain laboratory tests, particularly those that measure analytes using fluorescent methods. Inform your healthcare provider about any supplements you are taking before lab work (DrugBank).
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
There are no absolute contraindications for riboflavin (Vitamin B2) intake at physiological or common supplemental doses for the general population. Its safety profile is exceptionally high, and deficiency is more concerning than toxicity. However, caution is advised in specific, rare circumstances:
* **Known Allergy/Hypersensitivity:** As with any substance, an extremely rare hypersensitivity or allergic reaction to riboflavin or an excipient in a supplement formulation is a theoretical contraindication. Symptoms would include rash, itching, swelling, or difficulty breathing (DrugBank).
* **Severe Renal Impairment:** While not a strict contraindication, individuals with severely compromised kidney function may need to consult their physician before taking very high doses of any water-soluble vitamin. Impaired kidney function could theoretically reduce the efficient excretion of excess riboflavin (Mayo Clinic).
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Riboflavin (Vitamin B2) generally has a low potential for significant interactions with medications or other supplements. However, some interactions have been noted:
* **Antacids and Bicarbonates:** These agents may reduce the absorption of riboflavin by altering stomach pH. It is generally advisable to separate the intake of riboflavin supplements from antacids by a few hours (PubChem).
* **Chlorpromazine and Imipramine:** These tricyclic antidepressants have been reported to inhibit the absorption and utilization of riboflavin, potentially leading to a functional deficiency over time (DrugBank).
* **Other Medications:** Certain medications, such as some oral contraceptives, may increase riboflavin requirements due to their impact on riboflavin metabolism. Additionally, some diuretics might increase riboflavin excretion (MedlinePlus).
* **Alcohol:** Chronic excessive alcohol consumption can impair riboflavin absorption and metabolism, increasing the risk of deficiency (NIH Office of Dietary Supplements).
It is always prudent to discuss all medications and supplements you are taking with your healthcare provider to identify any potential interactions. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Riboflavin (Vitamin B2) is a water-soluble vitamin, meaning it is not stored extensively in the body and any excess is typically excreted. For optimal absorption and utilization, it is generally recommended to take riboflavin supplements:
* **With Food:** Taking riboflavin with a meal, especially one containing some fat, can enhance its absorption. Food helps stimulate bile flow, which aids in the uptake of fat-soluble vitamins and can also indirectly support the absorption of certain water-soluble vitamins like riboflavin (NIH Office of Dietary Supplements).
* **Morning:** Taking riboflavin in the morning is a common practice, aligning with the body's natural energy cycles, as it plays a key role in energy metabolism. Since it can alter urine color, morning intake might also be preferred by some individuals for convenience.
* **Consistent Dosing:** For individuals supplementing to address a deficiency or a specific health concern (e.g., migraines), consistent daily intake is more important than the exact timing within the day, though adherence is often better when taken at a regular time (Examine.com).
Source for this section: Sources for When should you take Vitamin B2 (Riboflavin)?: Jumps to this entry in the sources and references list at the end of the page.
What interacts with Vitamin B2 (Riboflavin)?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any vitamin + medication | Note | Category ruleConfidence: theoretical | Certain vitamins interact with specific medications (e.g., vitamin K with blood thinners).Source pending | Specific pairs are checked against a licensed source; confirm with your provider. |
Frequently asked questions about Vitamin B2 (Riboflavin)
Vitamin B2 (Riboflavin) is a vitamin. It is also known as Riboflavin and B2. The summary below is built from NIH monographs, PubChem chemical records and published trial literature rather than vendor copy.
Vitamin B2 (Riboflavin) is commonly discussed in the context of supporting mitochondria. Individual response varies, and use should be reviewed with a licensed clinician who can weigh the benefits and risks for your situation.
For Vitamin B2 (Riboflavin), it is typically taken in the morning and it is usually taken with food. Always follow the specific dose your clinician or the product label prescribes.
Vitamin B2 (Riboflavin) carries potential side effects and drug interactions, documented in NIH, Mayo Clinic, and FDA label sources. Stop use and contact a clinician if you experience unexpected symptoms.
Interaction risk for Vitamin B2 (Riboflavin) comes from the rest of the stack: other vitamins, prescription medicines, hormone therapy and peptides. Because Vitamin B2 (Riboflavin) is usually taken in the morning, most avoidable conflicts come from what else lands in that same window. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Vitamin B2 (Riboflavin) with no sign-up.
There is no single answer for Vitamin B2 (Riboflavin) plus TRT. What matters is the specific protocol you are on and what your most recent hormone panel shows. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
Pairing Vitamin B2 (Riboflavin) with peptides has to be assessed one peptide at a time, because GLP-1 agonists, secretagogues, healing peptides and melanocortins do not share an interaction profile. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Vitamin B2 (Riboflavin) varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken in the morning. Most protocols have it taken with food. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Vitamin B2 (Riboflavin) depends on the protocol and formulation you are on. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Vitamin B2 (Riboflavin) the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Which studies looked at Vitamin B2 (Riboflavin)?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Supplementation with Riboflavin (Vitamin B2) for Migraine Prophylaxis in Adults and Children: A Review(opens PubMed in a new tab)Int J Vitam Nutr Res · 2015 · PMID 26780280 · https://pubmed.ncbi.nlm.nih.gov/26780280/
- 2.Biosynthesis of vitamin b2 (riboflavin)(opens PubMed in a new tab)Annu Rev Nutr · 2000 · PMID 10940330 · https://pubmed.ncbi.nlm.nih.gov/10940330/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 493570(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/493570
Verify at
Publisher search links for Vitamin B2 (Riboflavin). These are places to check the information — they are not citations, so they are not numbered.
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- MedlinePlus(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- Examine.com(publisher search, opens in a new tab)Examine.com · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Vitamin B2 (Riboflavin)?
Plain-text summary, safe to quote verbatim:
Vitamin B2, also known as riboflavin, is an essential water-soluble vitamin that plays a crucial role in maintaining human health. Research on Vitamin B2 (Riboflavin) focuses on mitochondrial function. It is typically taken in the morning. Dose, response, and interaction risk vary by individual, so use should be reviewed with a clinician.
Source: DoseRoutine — https://doseroutine.com/library/vitamin-b2-riboflavin
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Vitamin B2 (Riboflavin) — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/vitamin-b2-riboflavin
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