vitaminNot FDA-approvedOTC supplementAvailable over the counter in the US as a dietary supplementClassic deficiency (documented as 'egg white injury') arises from avidin in large amounts of raw egg white binding biotinHigh-dose biotin supplements can interfere with troponin and thyroid immunoassays
Vitamin B7 (Biotin)Benefits, Dosage & Interactions
Also known as: Biotin, B7
Vitamin B7, commonly known as biotin, is a water-soluble vitamin that is part of the B-complex group. It plays a crucial role in various metabolic processes in the human body, primarily as a coenzyme for carboxylase enzymes. Research on Vitamin B7 (Biotin) focuses on healthy aging and weight loss.
How much Vitamin B7 (Biotin) do people take?
The depression trial used a multi-strain probiotic combined with 5 mg/day of biotin; the diabetes trial used 2 mg/day of biotin combined with chromium picolinate. Route reported: Oral. Frequency reported: Once daily in both randomized trials. These are amounts documented in the cited studies and labels for Vitamin B7 (Biotin) — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Strong — 2 human randomized trials published.
Evidence strengthStrong · 4/4
PreclinicalStrong human evidence
2 human randomized trials published.
Whole-body biological half-life
Not applicable
Typical timing
in the morning
Default unit
mcg
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 B7 (Biotin) in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Vitamin B7 (Biotin) entry is written from. Each number matches an inline marker above.
- [1]PROVIT: Supplementary Probiotic Treatment and Vitamin B7 in Depression-A Randomized Controlled TrialReininghaus EZ, Platzer M, Kohlhammer-Dohr A, et al. · Nutrients · 2020 · Peer-reviewed · PMID 33171595
- [2]The effect of chromium picolinate and biotin supplementation on glycemic control in poorly controlled patients with type 2 diabetes mellitus: a placebo-controlled, double-blinded, randomized trialSinger GM, Geohas J · Diabetes Technology & Therapeutics · 2006 · Peer-reviewed · PMID 17109595
- [3]Egg white injuryCammalleri L, Bentivegna P, Malaguarnera M · Internal and Emergency Medicine · 2009 · Peer-reviewed · PMID 18781405
References & Evidence
Sources on this page that document Vitamin B7 (Biotin) 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 B7 (Biotin) 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 B7 (Biotin)?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Vitamin B7, commonly known as biotin, is a water-soluble vitamin that is part of the B-complex group. It plays a crucial role in various metabolic processes in the human body, primarily as a coenzyme for carboxylase enzymes. These enzymes are involved in the metabolism of carbohydrates, fats, and proteins.
Biotin is essential for gluconeogenesis (the synthesis of glucose from non-carbohydrate sources), fatty acid synthesis, and the breakdown of certain amino acids. Because it is water-soluble, biotin is not stored in the body to a significant extent, and regular dietary intake is necessary. It can be obtained from a variety of foods, including egg yolks, nuts, seeds, sweet potatoes, and organ meats. The gut microbiota can also synthesize some biotin, though the extent of its absorption and contribution to human nutrition is still an area of research (NIH ODS).
Why vitamins for weight-loss: Biotin is a cofactor for enzymes in fatty acid and glucose metabolism. Deficiency is rare, so any weight-loss benefit is limited to correcting a shortfall — biotin is not a fat burner.
References: NIH ODS Biotin fact sheet (2022).
What does the research say about Vitamin B7 (Biotin)?
Tap a section to expand.
Biotin functions primarily as a covalently bound coenzyme for five carboxylase enzymes in mammals. These enzymes catalyze critical steps in metabolic pathways. The key biotin-dependent carboxylases include:
* **Pyruvate carboxylase:** This enzyme is vital for gluconeogenesis, converting pyruvate to oxaloacetate, a substrate for glucose synthesis. This process is particularly important for maintaining blood glucose levels when carbohydrate intake is low.
* **Acetyl-CoA carboxylase (ACC1 and ACC2):** These enzymes are rate-limiting in fatty acid synthesis (ACC1) and in regulating fatty acid oxidation in mitochondria (ACC2).
* **Propionyl-CoA carboxylase:** This enzyme is involved in the metabolism of odd-chain fatty acids, isoleucine, threonine, and methionine.
* **Methylcrotonyl-CoA carboxylase:** This enzyme is critical for the catabolism of leucine.
In these reactions, biotin acts as a carrier of activated carbon dioxide. It picks up CO2 from bicarbonate and transfers it to a substrate molecule. The binding of biotin to these enzymes involves a covalent bond between the carboxyl group of biotin and an epsilon-amino group of a specific lysine residue on the enzyme, a process mediated by the enzyme holocarboxylase synthetase. This enzymatic activity underscores biotin's fundamental role in maintaining metabolic homeostasis (PubChem, DrugBank).
Source for this section: Sources for How does Vitamin B7 (Biotin) work?: Jumps to this entry in the sources and references list at the end of the page.
Biotin has been studied for its potential role in several areas, primarily related to its metabolic functions and influence on keratin infrastructure.
* **Metabolic Support:** As a coenzyme for carboxylases, biotin is fundamental to the metabolism of macronutrients. It supports the body's ability to convert food into energy by assisting in the breakdown of carbohydrates, fats, and proteins. This includes its role in gluconeogenesis, which helps maintain stable blood glucose levels (NIH ODS).
* **Hair, Skin, and Nail Health:** While research is ongoing, biotin has gained popularity as a supplement for improving the strength and appearance of hair, skin, and nails. Some studies, particularly those involving individuals with underlying biotin deficiencies or brittle nail syndrome, have shown improvements in nail thickness and reduced splitting. For hair, some evidence suggests a benefit in cases of deficiency, but for otherwise healthy individuals, the effects are less clear, with many studies being small or observational (Cochrane, MedlinePlus).
* **Maternal and Fetal Health:** During pregnancy, there can be a slightly increased demand for biotin, and some women may experience marginal biotin deficiency. Adequate biotin is important for healthy fetal development, given its role in cell growth and metabolism. However, supplementation during pregnancy should always be discussed with a healthcare provider (NIH ODS).
Scientific evidence supporting the benefits of biotin varies depending on the specific application.
For **hair, skin, and nails**, the most compelling evidence comes from studies involving individuals with inherited biotin deficiency or specific conditions like brittle nail syndrome. For example, a review published in the Journal of Clinical and Aesthetic Dermatology found that patients with underlying pathology causing hair or nail issues benefited most from biotin supplementation, but also noted a lack of robust controlled trials in healthy individuals (Examine.com).
In the context of **metabolic function**, biotin's role as a coenzyme in carbohydrate, fat, and protein metabolism is well-established biochemistry, universally recognized by sources like PubChem. However, direct evidence for supplemental biotin improving metabolic health in individuals who are not deficient is less clear. Most studies demonstrating these enzymatic functions are in vitro or animal models.
Regarding **pregnancy**, some research indicates that marginal biotin deficiency can occur during gestation, potentially due to increased metabolic demand. Observational studies have noted lower biotin levels in some pregnant women compared to non-pregnant controls (NIH ODS). However, the clinical significance of these marginal deficiencies and the necessity of routine biotin supplementation in all pregnant women are still subjects of active research.
Overall, while biotin's fundamental metabolic roles are undisputed, the evidence for widespread benefits of supplementation in healthy, non-deficient populations, particularly for cosmetic purposes, is less robust and often relies on smaller trials or anecdotal reports. More large-scale, placebo-controlled studies are needed to solidify these claims (Mayo Clinic).
Biotin is generally considered safe when taken at commonly studied doses. Because it is a water-soluble vitamin, excess amounts are typically excreted in the urine. However, some mild side effects have been reported:
* **Digestive Issues:** In some individuals, high doses of biotin can cause mild gastrointestinal upset, such as nausea, cramping, or diarrhea.
* **Skin Rash:** Rarely, some people might develop skin rashes, particularly if taking very high doses.
* **Acne:** There have been anecdotal reports of biotin supplementation exacerbating or triggering acne, though scientific evidence for this connection is not strong.
It is important to note that these side effects are uncommon and generally mild. If any adverse reactions occur, discontinuing the supplement or reducing the dose is typically sufficient. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
While generally safe, there are some important considerations when taking biotin:
* **Interference with Lab Tests:** High doses of biotin can significantly interfere with certain laboratory tests, particularly those that use biotin-streptavidin technology. This includes tests for thyroid function (TSH, free T3/T4), cardiac troponin (important for heart attack diagnosis), and hormone levels (e.g., cortisol, parathyroid hormone). This interference can lead to falsely high or low results, potentially leading to misdiagnosis or inappropriate treatment. Healthcare providers should be informed of biotin supplementation, especially before any lab tests (FDA label).
* **Kidney Dialysis:** Individuals undergoing kidney dialysis may have altered biotin metabolism and warrant careful monitoring and discussion with a nephrologist before supplementation (NIH ODS).
* **Allergic Reactions:** As with any supplement, a rare allergic reaction is possible. Symptoms might include rash, itching, swelling, severe dizziness, or trouble breathing. Seek immediate medical attention if these occur.
Always discuss any concerns or pre-existing conditions with a healthcare professional. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
There are no absolute contraindications for biotin in healthy individuals at commonly encountered doses, apart from known allergy or hypersensitivity.
However, individuals with certain rare, inherited metabolic disorders that affect biotinidase or holocarboxylase synthetase activity (e.g., biotinidase deficiency, holocarboxylase synthetase deficiency) cannot properly utilize biotin and require specific medical management, often involving tailored biotin supplementation under strict medical supervision. For these conditions, self-supplementation is inappropriate and could be harmful. Diagnosis and management of these disorders are highly specialized (NIH ODS, MedlinePlus).
Patients with severe kidney disease or those on dialysis should exercise caution. Also, while not a contraindication, the potential for interference with laboratory tests means that individuals undergoing frequent diagnostic testing for conditions where biotin-dependent assays are used should inform their medical team to avoid potential misdiagnosis. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Biotin generally has a low potential for significant drug interactions. However, a few interactions are worth noting:
* **Anticonvulsant Medications:** Long-term use of certain anticonvulsant drugs, such as carbamazepine, phenytoin, primidone, and phenobarbital, can accelerate biotin catabolism. This can lead to marginal biotin deficiency and may necessitate higher biotin intake. Individuals on these medications should consult their doctor regarding biotin levels and potential supplementation requirements (NIH ODS).
* **Raw Egg Whites:** Raw egg whites contain avidin, a protein that binds tightly to biotin, preventing its absorption in the digestive tract. Regular consumption of large amounts of raw egg whites can induce biotin deficiency. Cooking denatures avidin, eliminating this interaction.
* **Alcohol:** Chronic excessive alcohol consumption can inhibit biotin absorption and utilization, potentially leading to lower biotin levels.
* **Antibiotics:** Long-term use of broad-spectrum antibiotics can disrupt the gut microbiota that normally synthesize some biotin. While significant deficiency from this cause is rare, it is a theoretical consideration (NIH ODS).
Consult a healthcare professional or pharmacist if you have concerns about potential interactions with any medications or other supplements you are taking. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Biotin is a water-soluble vitamin with a half-life of approximately 2 hours. Due to its short half-life and water-soluble nature, it is typically taken once daily. Many individuals prefer to take biotin in the morning, often with food, to align with daily metabolic activities and avoid any potential, albeit rare, digestive upset. As it is not known to cause drowsiness or stimulate, morning intake is a common and convenient practice. Absorption is generally not significantly affected by food, so it can be taken either with or without a meal.
Source for this section: Sources for When should you take Vitamin B7 (Biotin)?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
Reading about Vitamin B7 (Biotin) is the first step — DoseRoutine helps you act on it. These free tools turn what you just learned into a routine.
What interacts with Vitamin B7 (Biotin)?
| 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 B7 (Biotin)
While some individuals, especially those with certain deficiencies or conditions like brittle nail syndrome, may experience improvements in hair and nail quality with biotin supplementation, for most healthy individuals, the evidence for accelerated growth is not strong. Biotin's primary role is in cell growth and metabolism, which is fundamental to healthy hair and nail formation, but direct acceleration beyond normal rates is not consistently observed in non-deficient populations.
Yes, biotin is found in a variety of common foods, including egg yolks, nuts, seeds, sweet potatoes, liver, and some vegetables. The gut microbiota also synthesizes some biotin. For most healthy adults, a balanced diet typically provides sufficient biotin to meet daily requirements, making overt deficiency rare. Concerns about dietary intake should be discussed with a healthcare professional or registered dietitian (NIH ODS).
Biotin is generally considered safe, even at higher doses, because it is water-soluble and excess amounts are usually excreted in urine. Serious toxicity is rare. However, extremely high doses can interfere with certain lab tests, leading to inaccurate results (e.g., thyroid tests, cardiac markers). Mild digestive upset or skin issues are also rare possibilities. Always inform your healthcare provider about any supplements you are taking (Mayo Clinic, FDA label).
If you are taking biotin for hair, skin, or nail health, it may take several weeks to several months to notice any potential effects. This is because hair and nails grow slowly, and it takes time for new, healthier cells to develop and become visible. Consistency is key, and individual results can vary significantly (MedlinePlus).
Yes, some medications can affect biotin levels or vice-versa. Certain anticonvulsant drugs can increase biotin metabolism, potentially leading to deficiency. High doses of biotin can also interfere with various laboratory tests. It's crucial to inform your doctor and pharmacist about all supplements and medications you are taking to check for potential interactions, especially before any lab tests (NIH ODS, FDA label).
Vitamin B7 (Biotin) is typically taken in the morning. Amounts for this vitamin vary by protocol, formulation and individual response, so follow the dose your clinician or the product label specifies.
Whether Vitamin B7 (Biotin) fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. 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
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to Vitamin B7 (Biotin). 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 B7 (Biotin) varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken in the morning. 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 B7 (Biotin) 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 B7 (Biotin) 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.
The depression trial used a multi-strain probiotic combined with 5 mg/day of biotin; the diabetes trial used 2 mg/day of biotin combined with chromium picolinate. Route reported: Oral. Frequency reported: Once daily in both randomized trials. These are amounts documented in the cited studies and labels for Vitamin B7 (Biotin) — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at Vitamin B7 (Biotin)?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Biotin: From Nutrition to Therapeutics(opens PubMed in a new tab)The Journal of nutrition · 2017 · PMID 28701385 · https://pubmed.ncbi.nlm.nih.gov/28701385/
- 2.A Review of the Use of Biotin for Hair Loss(opens PubMed in a new tab)Skin appendage disorders · 2017 · PMID 28879195 · https://pubmed.ncbi.nlm.nih.gov/28879195/
- 3.Biotin Homeostasis and Human Disorders: Recent Findings and Perspectives(opens PubMed in a new tab)International journal of molecular sciences · 2024 · PMID 38928282 · https://pubmed.ncbi.nlm.nih.gov/38928282/
- 4.Biotin Deficiency(opens PubMed in a new tab)2026 · PMID 31613531 · https://pubmed.ncbi.nlm.nih.gov/31613531/
- 5.Biotinidase Deficiency(opens PubMed in a new tab)1993 · PMID 20301497 · https://pubmed.ncbi.nlm.nih.gov/20301497/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 171548(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/171548
Verify at
Publisher search links for Vitamin B7 (Biotin). 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
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- FDA-approved labeling (DailyMed)(publisher search, opens in a new tab)U.S. Food and Drug Administration · 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
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- PubMed literature search(publisher search, opens in a new tab)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 B7 (Biotin)?
Plain-text summary, safe to quote verbatim:
Vitamin B7, commonly known as biotin, is a water-soluble vitamin that is part of the B-complex group. It plays a crucial role in various metabolic processes in the human body, primarily as a coenzyme for carboxylase enzymes. Research on Vitamin B7 (Biotin) focuses on healthy aging and weight loss.
Source: DoseRoutine — https://doseroutine.com/library/vitamin-b7-biotin
Vitamin B7 (Biotin) cheat sheet
DoseRoutine cheat sheet · Vitamin
Vitamin B7 (Biotin)
Vitamin B7, commonly known as biotin, is a water-soluble vitamin that is part of the B-complex group. It plays a crucial role in various metabolic processes in the human body, primarily as a coenzyme for carboxylase enzymes.
Evidence
Strong
2 human randomized trials published.
Studied range
The depression trial used a multi-strain probiotic combined with 5 mg/day of biotin; the diabetes trial used 2 mg/day of biotin combined with chromium picolinate
Route
Oral
Frequency studied
Once daily in both randomized trials
Half-life
Not established in the cited human literature
Timing
in the morning
Storage
Room temperature, away from moisture and light
Not FDA-approvedOTC supplementAvailable over the counter in the US as a dietary supplementClassic deficiency (documented as 'egg white injury') arises from avidin in large amounts of raw egg white binding biotinHigh-dose biotin supplements can interfere with troponin and thyroid immunoassaysLongevityWeight Loss
Key references
- PROVIT: Supplementary Probiotic Treatment and Vitamin B7 in Depression-A Randomized Controlled Trial (2020)
- The effect of chromium picolinate and biotin supplementation on glycemic control in poorly controlled patients with type 2 diabetes mellitus: a placebo-controlled, double-blinded, randomized trial (2006)
- Egg white injury (2009)
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/vitamin-b7-biotin
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Vitamin B7 (Biotin) — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/vitamin-b7-biotin
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