For hair growth: choose Botanic Hearth Rosemary Hair Oil, provided your scalp tolerates it.

Why:

For anti-aging: neither is a meaningful anti-aging treatment for facial skin. Do not use either oil as your main anti-aging product. The evidence-based basics are daily broad-spectrum SPF 30+ and, if suitable for you, a retinoid at night. Oils can reduce dryness and make skin look temporarily smoother, but they do not reliably treat wrinkles, pigmentation, or collagen loss.

If you have gradual widening of the part, receding temples, or thinning at the crown, hair oils alone usually will not reverse it. Dermatology references list topical minoxidil as a standard therapy for pattern hair loss, with other options depending on sex and diagnosis (Cecil Medicine). Consider a dermatologist evaluation if shedding is sudden, patchy, associated with scalp inflammation, or persists beyond 3 months.

For preventing or reversing grey hair, I would not choose either oil expecting anti-grey results.

Bottom line: Neither product is proven to turn grey hair black again. Once a follicle stops producing melanin, oils generally cannot restart pigment production. Textbook sources describe greying as related to oxidative damage and depletion of pigment-cell stem cells.

If greying began unusually early, increased quickly, or occurs with fatigue, hair fall, weight change, or skin depigmentation, see a dermatologist. They may consider checking:

B12 deficiency and hypothyroidism are associated with premature greying, and treating a confirmed cause may help limit progression, though it does not reliably reverse already-grey strands (review of premature greying).

For appearance, hair dye, henna, or indigo are the dependable options. Avoid high-dose biotin, B12, copper, or “anti-grey” supplements unless a deficiency is confirmed.