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Biotin (Vitamin B7)

Biotin (Vitamin B7 / Vitamin H)

生物素

Pinyin: Shēng Wù Sù

🌿

Plant Family

B-vitamin (not a plant)

Part Used

Synthetic vitamin supplement

Origin

Synthesized by intestinal bacteria; also found in foods (egg yolks, nuts, seeds, sweet potatoes)

Safety Level

Safe

Overview

Biotin, also known as vitamin B7 or vitamin H, is a water-soluble B vitamin that plays a crucial role in energy metabolism and the health of hair, skin, and nails. It acts as a coenzyme in several important metabolic processes. Biotin is often called "the beauty vitamin" because of its well-known effects on hair, skin, and nail health. While true biotin deficiency is rare, many people supplement with biotin for cosmetic benefits.

Traditional Chinese Medicine Properties

Nature (四气)

neutral

Flavors (五味)

sweet / bland

Meridians (归经)

skin, hair, nails, nervous system

Health Benefits

✓ Hair: may improve hair strength, reduce hair thinning, and promote hair growth (especially in those with deficiency or brittle hair)
✓ Nails: significantly strengthens brittle nails and reduces splitting (clinical evidence)
✓ Skin: supports healthy skin; may help with seborrheic dermatitis and acne (in those with deficiency)
✓ Energy metabolism: helps break down carbohydrates, fats, and proteins
✓ Blood sugar: may help improve blood sugar control in type 2 diabetes (some research)
✓ May reduce symptoms of peripheral neuropathy (nerve damage)
✓ Supports healthy pregnancy and fetal development (critical for cell growth)
✓ May help with multiple sclerosis symptoms (high-dose biotin - emerging research)
✓ Cognitive health (supports myelin production)
✓ May help with brittle hair and split ends

Traditional Uses

  • Hair health: strengthens hair, reduces hair loss, improves hair growth
  • Nail health: strengthens brittle nails, reduces splitting
  • Skin health: supports healthy skin, may help with rashes and dermatitis
  • Blood sugar regulation (helps metabolize carbohydrates and fats)
  • Energy metabolism (coenzyme for carboxylase enzymes)
  • Pregnancy support (important for fetal development)
  • Nerve health
  • Cradle cap in infants (deficiency sign)

Active Constituents

The key compounds responsible for this herb's therapeutic effects:

Biotin (vitamin B7 - the active compound itself)Biotin is a coenzyme that works with:Acetyl-CoA carboxylase (fatty acid synthesis)Pyruvate carboxylase (gluconeogenesis)Propionyl-CoA carboxylase (amino acid metabolism)Beta-methylcrotonyl-CoA carboxylase (leucine metabolism)S-form of biotin is biologically active (d-biotin)Biotin is a sulfur-containing B vitamin

Usage & Dosage

How to Use

Capsule, tablet, gummy, liquid drops, powder, topical hair/skin products (though oral is more effective). Often combined with other B vitamins, collagen, keratin, or silica for beauty benefits.

Suggested Dosage

Standard beauty dose: 2,500–10,000 mcg (2.5–10 mg) daily; therapeutic doses (MS, nerve conditions): up to 300 mg daily (under medical supervision); RDA: 30 mcg daily for adults; pregnancy: 35 mcg. For hair/nail benefits, 2500–10000 mcg is commonly used. Effects on hair/nails take 2–4 months of consistent use. Excess biotin is excreted in urine (low toxicity).

Quality & Storage

Harvest Season

Biotin is not harvested from plants - it is a synthetically produced vitamin supplement. It can also be obtained from food sources: eggs (cooked yolks), nuts, seeds, sweet potatoes, leafy greens, salmon, dairy products, liver, avocados. Intestinal bacteria also produce biotin.

Quality Indicators

Look for: d-biotin (the natural, biologically active form - avoid synthetic dl-biotin), third-party testing for purity, no unnecessary fillers/additives, GMP certified manufacturing, appropriate dosage form. For beauty supplements, biotin is often combined with collagen peptides, MSM, silica, vitamin C, and other hair/skin/nail nutrients. High-dose biotin (10,000 mcg+) should be used with awareness of lab test interference.

Storage

Capsules/tablets: cool dry place, 2–3 years. Protect from light and moisture. Biotin is relatively stable.

Safety Information

Contraindications

Allergy to biotin or any ingredients in the supplementPregnancy and breastfeeding (high doses - stick to prenatal dose unless advised by doctor; normal doses are safe)Biotin supplements can interfere with certain lab tests (see drug interactions - IMPORTANT)Children (follow age-appropriate doses; deficiency is rare in healthy children)Those with biotinidase deficiency (need medical supervision)Generally very safe; biotin is water-soluble and excess is excreted

Possible Side Effects

  • Extremely safe and well-tolerated at all doses (even very high doses)
  • Rare: mild digestive upset, nausea, diarrhea (very high doses)
  • Rare: skin rash or acne breakout (high doses may cause breakouts in some people - usually subsides)
  • No known serious toxicity (water-soluble, excess excreted in urine)
  • No known serious side effects even at very high doses
  • Important: biotin can interfere with many blood lab tests (see drug/interactions) - tell your doctor if you're taking biotin before blood tests

Drug Interactions

  • Biotin can INTERFERE with many LABORATORY BLOOD TESTS, giving false high or false low results (very important!) - including thyroid tests (TSH, T3, T4), troponin (heart attack markers), hormone tests, vitamin D tests, and others. Stop biotin 72 hours before any blood test.
  • Egg whites: raw egg whites contain avidin which binds biotin and prevents absorption (cooking destroys avidin)
  • Antibiotics: may reduce biotin-producing gut bacteria
  • Anticonvulsants (phenytoin, carbamazepine, etc.): may increase biotin breakdown and cause deficiency
  • Anti-diabetic medications: biotin may lower blood sugar (beneficial but monitor)
  • Minimal direct drug interactions, but LAB TEST INTERFERENCE is clinically important

Note: Always consult with a qualified healthcare practitioner before starting any herbal supplement, especially if you are pregnant, nursing, have medical conditions, or take medications.

References & Research

Information on this page is based on traditional herbal knowledge and modern scientific research. For a comprehensive list of references, please refer to our full citations page.

ℹ️ Disclaimer

This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. The FDA has not evaluated these statements. Always consult a qualified healthcare provider before using herbal supplements.

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