Herbs for hair growth: what the evidence actually shows

Herbs for hair growth sit at the boundary between cosmetic haircare and medical treatment. Ingredients such as fenugreek, rosemary and ginseng feature in traditional remedies and online experiments, but evidence that a plant can condition strands is not evidence that it can reverse hair loss.

A YouTube experiment involving a homemade herbal rinse illustrates that distinction. Creator Deborah Boms is testing a mixture while tracking her hair’s length and texture. According to Healthline, meanwhile, much of the research behind herbal growth claims comes from animal studies: an important limitation for anyone deciding what to put on a thinning scalp.

What happened

Boms describes wanting longer, softer natural hair after previously experiencing heat damage and cutting it. Her water-based preparation contains cinnamon, cloves, fenugreek seeds and rosemary. She presents it as a personal experiment and acknowledges that research supporting some ingredients is limited.

The distinction between water and oil matters here. Small human studies have investigated rosemary oil, but those findings cannot establish that rosemary steeped in water has the same effect. Different preparations extract different substances, and their concentration, stability and ability to reach the skin can vary substantially.

Fenugreek also needs careful interpretation. Healthline cites research involving a food supplement containing fenugreek and micronutrients that reported improvements in hair volume and thickness. Results from a combined oral supplement cannot show that fenugreek alone works, or that putting the seeds into a rinse produces comparable benefits.

Other findings sit further from everyday treatment. Research discussed by Healthline found hair-growth effects from false daisy in mice and night-flowering jasmine in rats. These experiments can help researchers identify promising substances, but animal hair cycles and experimental conditions differ from those of people with long-standing thinning.

Nor is this evidence that a herbal mixture performs like an established medicine. For pattern hair loss, treatments such as minoxidil have a stronger clinical evidence base, although they do not help everyone. Our guide to female pattern baldness and its treatment options explains how the cause and pattern of thinning influence the choices available.

The background

Hair grows from follicles, the small structures within the skin that produce each strand. Follicles move through periods of growth, transition and rest. A treatment intended to change that cycle must be distinguished from a conditioner that acts mainly on the hair already visible above the scalp.

Conditioning can still be useful. By making strands easier to detangle and reducing friction, suitable products can limit breakage and help preserve length. This is particularly relevant to tightly curled hair, where shrinkage can also make changes in length less obvious. Neither effect necessarily means more hairs are growing.

Hair loss itself has several causes. Androgenetic alopecia, or inherited pattern hair loss, gradually produces finer hairs. Telogen effluvium is increased shedding that can follow illness, childbirth or other physical stresses. Alopecia areata involves an immune attack on follicles, while some inflammatory conditions can scar them permanently.

That variety explains why one botanical ingredient is unlikely to suit every problem. Our guide to alopecia types, causes and warning signs sets out how gradual thinning differs from sudden patches and changes accompanied by scalp symptoms.

Some herbal claims focus on 5-alpha reductase, an enzyme that helps convert testosterone into dihydrotestosterone, or DHT. This hormone contributes to pattern hair loss in susceptible follicles. Laboratory evidence that a plant extract affects the enzyme does not establish that a finished hair product delivers a useful effect in people.

Finasteride targets this pathway and has clinical evidence for male pattern hair loss, alongside recognised risks and prescribing considerations. Describing a herb as acting on the same enzyme does not make it an equivalent substitute. Our explanation of finasteride’s benefits, risks and UK use covers that separate treatment decision.