This is a topical scalp oil, not an oral supplement — so it works differently than the capsules and powders you'd typically compare it to. The star ingredient is **rosemary oil**, which has modest clinical backing for hair growth: one RCT found topical rosemary oil comparable to 2% minoxidil over six months, though evidence is still limited to a handful of small trials. The blend also includes **castor oil** and **jojoba oil** as carrier oils that help condition the scalp and smooth the hair shaft.

**Peppermint oil** adds a tingling sensation and has one animal study suggesting it may increase dermal thickness and follicle count, but there are no human trials confirming hair growth benefits. **Biotin** and **vitamin D** appear in the ingredient list, but as trace additions in a topical oil with no listed concentrations — their contribution here is negligible compared to oral dosing.

Since this is a leave-in topical product, you won't get the kind of measurable clinical dosing you'd find in an oral hair supplement. If your goal is hair growth support, the rosemary oil base gives this product a reasonable rationale, but set expectations accordingly — the evidence is early-stage and the format limits what the other listed nutrients can deliver.

BioStacks
Mielle

Scalp & Hair Strengthening Oil, Rosemary Mint, 2 fl oz (59 ml)

Oil

iHerbAmazon

Other Ingredients (31)

BiotinFood

Vitamin B7, a water-soluble B-vitamin.

Coconut OilCarrier

Edible oil from coconut used as a release/anti-sticking agent and carrier in gummies and soft formats

Peppermint OilFlavor

Essential oil distilled from peppermint (Mentha piperita) leaves.

Natural FlavorsFlavor

Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Wheat FlourFood

Milled wheat used as a food/flavor ingredient; contains gluten.

Ascorbic AcidAntioxidant

Vitamin C used as an antioxidant preservative in supplements to prevent oxidation

Safflower Seed OilCarrier

Light, neutral oil from safflower seeds used as a carrier in softgels for fat-soluble nutrients

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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