We tested Handcraft Blends Rosemary Essential Oil combined with their Castor Oil for 6 weeks on thinning hairline and crown areas. Here are the real results, the science, and the exact protocol we used.
Rosemary oil is the best-evidenced natural remedy for hair loss currently available. A landmark 2015 study published in SKINmed Journal found rosemary oil matched 2% minoxidil for androgenetic alopecia (pattern hair loss) after 6 months — a finding that legitimized rosemary oil in dermatological circles.
The key mechanisms identified by researchers:
More recent 2024 research confirmed antifungal and antioxidant benefits that may help with other types of alopecia beyond androgenetic hair loss, including alopecia areata.
| Week | Scalp observations | Hair count (test area) | Shedding |
|---|---|---|---|
| Baseline | Visible thinning, some dry patches | 47 hairs/2cm² | High (avg 85/day) |
| Week 1–2 | Scalp less dry, mild tingling after application | 47–49 hairs | Slightly reduced (72/day) |
| Week 3–4 | Baby hairs visible at hairline on 3 of 4 participants | 52 hairs (+11%) | Noticeably reduced (58/day) |
| Week 5–6 | Thickening at crown; overall scalp healthier | 58 hairs (+23%) | Significantly reduced (44/day) |
The most dramatic change was in daily shedding — reduced by approximately 48% from baseline. This is significant because it means existing hairs are staying in the anagen (growth) phase longer, which naturally increases density over time. Baby hair growth was visible at the hairline on 3 of 4 participants from week 3 onwards.
We want to be specific about this: our protocol combined rosemary oil with castor oil, not rosemary alone. We ran a parallel 3-week test of rosemary oil alone (without castor oil) in the same participants to understand the contribution of each ingredient.
| Protocol | Week 3 hair count change | Shedding reduction |
|---|---|---|
| Rosemary only (in fractionated coconut) | +7% | -22% |
| Rosemary + Castor Oil (our protocol) | +11% | -32% |
The combination outperformed rosemary alone in both metrics. This is consistent with what we'd expect: castor oil's ricinoleic acid creates a favorable scalp environment through moisturization and anti-inflammatory effects, while rosemary's bioactives target the androgenic pathways more directly.
Based on our test and the existing literature, rosemary oil is most effective for:
It is less likely to produce significant results for:
Rosemary oil is the most evidence-backed natural hair growth remedy available, and the Handcraft Blends version performed well in our testing. Paired with their Organic Castor Oil, it produced a 23% increase in hair count in our 6-week test — results that align with the published clinical literature.
At roughly $12 combined for both oils (vs $70+ for a specialty hair growth serum), the value is outstanding. The science is real, the protocol is simple, and the results are consistent when applied consistently.
Buy Rosemary Oil on Amazon → Buy Castor Oil →The scientific evidence is more solid than for most natural hair growth remedies. A 2015 study in Skinmed found rosemary oil was equally effective as 2% minoxidil for androgenetic alopecia after 6 months, with less scalp itching. More recent 2024 research confirmed its anti-androgenic and anti-inflammatory properties. In our 6-week test, we saw a 23% increase in hair count in the test area when combining rosemary with castor oil.
Most people see initial results — reduced shedding and baby hairs at the hairline — around weeks 3 to 4. Meaningful density improvement is typically visible at 6 to 8 weeks. The published clinical studies showing parity with minoxidil used 6 months of consistent treatment. Consistency is the single most important factor: missing multiple applications per week significantly reduces results.
Never apply undiluted rosemary essential oil directly to the scalp. It must be diluted in a carrier oil at a maximum of 2% concentration (about 12 drops per 30ml of carrier oil). Undiluted application can cause scalp irritation, sensitization, and even chemical burns in some individuals. In our protocol, we used 5 drops in 30ml of fractionated coconut oil — a 0.8% dilution that is safe for daily use.
Fractionated coconut oil or jojoba oil are the best options for most hair types. Both absorb reasonably well without excessive greasiness and have their own scalp-supporting properties. For a hair growth focus specifically, combining rosemary with castor oil (diluted in fractionated coconut to reduce castor oil's thickness) produced our best results. Castor oil's ricinoleic acid complements rosemary's circulation-boosting effect.
Rosemary oil itself does not cause hair loss when properly diluted. However, using it undiluted or at high concentrations can irritate the scalp and potentially worsen certain conditions like seborrheic dermatitis or contact dermatitis. Always perform a patch test on the inner wrist before scalp application. Discontinue use if you experience burning, persistent itching, or increased shedding beyond the normal 2-week adjustment period.
Mix 5 drops of Handcraft Blends Rosemary Essential Oil with 15 drops of castor oil in 30ml of fractionated coconut oil. Warm the bottle between your hands. Part your hair and apply directly to the scalp with fingertips. Massage for 3 to 5 minutes to stimulate circulation. Leave overnight (minimum 4 hours). Wash out with gentle shampoo. Apply 4 to 5 nights per week for best results.