Ingredient Guide

Biotin for Metabolism, Hair, and Skin

Biotin (vitamin B7) is a B vitamin with a clear metabolic job — it acts as a cofactor for enzymes that break down fats, carbohydrates, and proteins. It's also the vitamin most associated with hair and skin, though supplementation mainly matters when you're low, not as a guaranteed growth booster for people already getting enough.

  • Evidence-based
  • Structure/function only
  • No proprietary blends

What it is

Biotin is a water-soluble B vitamin found in eggs, nuts, seeds, and some vegetables. Severe deficiency can cause hair thinning and skin rashes, which is why it's so often linked to beauty supplements — but deficiency in healthy people eating a mixed diet is rare, and that's the context worth keeping in mind.

How it works

As a cofactor for carboxylase enzymes, biotin supports normal macronutrient metabolism — the processing of fats, carbs, and proteins your body uses for energy and building blocks. The hair and skin connection comes from that metabolic role: when biotin is genuinely low, hair and skin can suffer; restoring adequate levels supports their normal maintenance.

Why the form & source matter

Biotin in supplements is usually straightforward free biotin, and absorption is efficient even at higher doses. The more practical variable is dose relative to the adequate intake (30 mcg/day for adults) — many hair-skin-nails formulas use much more, which is common in the category but not something the evidence strongly supports for healthy people. Very high doses can also interfere with some lab tests, so timing around bloodwork matters.

How Monthlees uses it

Monthlees offers biotin in Hair Skin Nails Gummies and Radiate Strips — both positioned in the beauty-and-wellness lane where biotin is a familiar, expected ingredient. It's part of a broader formula in each, not a standalone megadose product.

Frequently asked questions

What does biotin do?

It supports normal macronutrient metabolism and the maintenance of normal hair and skin.

Will biotin make my hair grow faster?

It supports normal hair maintenance, but extra biotin doesn't reliably speed growth in people who aren't deficient — the evidence for that is thin.

Who might be low?

True deficiency is rare in healthy adults; it's more relevant with certain medical conditions or very restricted diets.

Which Monthlees products contain it?

Hair Skin Nails Gummies and Radiate Strips.

Research & references

  1. Biotin — Health Professional Fact Sheet — NIH Office of Dietary Supplements (source)
    Biotin is a cofactor for enzymes in macronutrient metabolism (structure/function).
  2. Biotin — Health Professional Fact Sheet (Hair, skin, nails section) — NIH Office of Dietary Supplements (source)
    Limited evidence that biotin improves hair, skin, or nails in healthy people without deficiency (structure/function context).

References are provided for general educational context. They do not imply that this product treats, cures, or prevents any disease.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Find your pattern →

Free 3-minute assessment. No purchase required.

Hair, Skin, & Nails Gummies

Hair, Skin, & Nails Gummies

6,000 mcg biotin plus collagen, vitamins A–E, and zinc — beauty nutrients in two daily gummies.

Guest $32.30
Member
Radiate+ Strips

Radiate+ Strips

5,000 mcg biotin plus vitamin D3 and folate — fast-dissolving orange oral strips for hair, skin, and nail support on the go.

Guest $34.62
Member

Monthlees membership

Unlock member pricing on every reorder — cancel anytime.

Join for member pricing →

Explore more guides

See how this ingredient fits into broader goals and daily routines.