Myth: "Oils make hair grow"

The myth

Rosemary, castor and other oils are widely sold as hair-growth treatments.

The facts: how it really works

Oils coat hair and reduce friction and water loss, which can reduce breakage. A small trial compared rosemary oil with low-strength minoxidil, but the evidence is limited. Proven growth treatments like minoxidil work on the follicle's growth cycle.

Why it matters on darker skin

Heavy oils on the scalp can worsen dandruff and folliculitis.

Where the myth comes from

Less breakage looks like more growth.

What actually helps — and why

Minoxidil for pattern hair loss (pharmacist advice): prolongs growth phase. Expected timeline: 4–6 months. Oil the ends, not the scalp, if dandruff-prone: reduces breakage. Expected timeline: weeks.

More detail

Oils are widely marketed for hair 'growth', but how fast hair grows is set by the follicle, which is deep within the scalp. Most oils act on the hair shaft: they reduce friction between strands, slow water loss and make hair more flexible, which means fewer breaks and better length retention. Coconut oil has some evidence of reducing protein loss when applied before washing. Rosemary oil gained attention from one small trial comparing it with low-strength minoxidil in men with pattern hair loss; the study was short and small, and the result has not been confirmed in larger trials. Castor oil has no good clinical evidence for growth. Undiluted essential oils can cause irritation and allergy, and heavy oils on the scalp can worsen dandruff and folliculitis. For pattern hair loss, minoxidil remains the best-studied over-the-counter option, after speaking to a pharmacist or doctor.

What to avoid and why

Avoid applying undiluted essential oils to the scalp.

Common mistakes

• Expecting oils to regrow scarred areas.

Handling textured hair gently

Coily and curly hair is naturally the most fragile hair type because each bend in the strand is a weak point and natural oils travel down it slowly. That makes handling — how often and how firmly hair is combed, styled and pulled — as important as which products you buy. Detangle only when hair is wet and coated in conditioner, working in sections from the ends towards the roots with fingers or a wide-tooth comb. Keep heat to the lowest effective setting and always use a heat protectant. Sleep on satin or silk, or wear a satin bonnet, to reduce friction. Between wash days, a water-based leave-in followed by a light oil or cream helps hold moisture. Give the scalp attention too: it is skin, and needs regular cleansing, especially under wigs, weaves and braids, to prevent build-up, itch and infection. Any style that hurts, causes bumps or leaves the scalp tender is too tight and should be loosened. Hair grows about one centimetre a month, so changes in care take two to three months to show in length and thickness.

Scalp health and product choice

Choose a shampoo that suits the scalp and a conditioner that suits the lengths: the scalp may need cleansing or a medicated shampoo while the ends need moisture. Fragrance, essential oils and heavy waxes can irritate a sensitive scalp or cause build-up, and heavy oils on the scalp may worsen dandruff. Look for a clear ingredient list and a NAFDAC number, and patch-test new dyes and relaxers 48 hours before every use. Products that promise dramatic growth are usually untested; the treatments with the best evidence for pattern hair loss are medicines such as minoxidil, which should be started only after speaking to a pharmacist or doctor. Signs that you need medical advice rather than a new product include patches of hair loss, scarring or shiny skin, pain, pus, or shedding that continues for more than six months.

Questions to ask your doctor or pharmacist

Useful questions include: What do you think is causing this? Is it likely to come back, and how can I prevent it? Which products should I stop? How long before I should expect improvement, and when should I come back if it isn't better? Are there side effects to watch for? Is this treatment safe if I am pregnant, breastfeeding or for my child? Writing your questions down, bringing your products (or photos of their labels) and taking dated photos of the problem make an appointment much more useful.