Berberine (Barberry) and Hair: Effects on Hair Loss and the Scientific Evidence

What is berberine and how does it relate to barberry?

Berberine is an isoquinoline alkaloid obtained from plants such as Berberis vulgaris, Coptis chinensis and Hydrastis canadensis. It has mostly been studied for blood sugar, blood lipids and polycystic ovary syndrome (PCOS).

Very little reaches the bloodstream when it is taken by mouth; much of its effect may occur in the gut and through the gut microbiota. How much reaches the hair follicle is therefore an important question when interpreting hair-related findings.

Is barberry good for hair?

Barberry (Berberis vulgaris) is known in Türkiye for its sour red berries and its root bark. Berberine is concentrated mainly in the root and stem bark; the berries used in food and tea contain much less.

No controlled human study has examined barberry tea, oil, powder or barberry shampoos for hair loss. The positive findings on the hair follicle come from laboratory and mouse studies of purified berberine and cannot be transferred directly to barberry products.

• The berberine content of herbal products is not standardised.
• Berberine is a yellow dye; home-made mixtures applied to the scalp may cause irritation and discolour light hair.
• Barberry root and berberine supplements carry the same warnings on drug interactions and pregnancy.

Effects on the hair root and follicle

Dermal papilla and the Wnt/β-catenin pathway

The dermal papilla at the base of the follicle controls when and how long hair grows. Wnt/β-catenin signalling in these cells is a key pathway for starting and maintaining anagen; in androgenetic alopecia it weakens and the follicle shrinks (miniaturisation).

In a 2025 study published in Phytomedicine:

• Berberine increased proliferation of human dermal papilla cells.
• It lengthened isolated normal and miniaturised hair follicles.
• Applied to the skin of depilated mice, it accelerated regrowth, brought forward the telogen-to-anagen transition and prolonged anagen.
• The proposed mechanism is binding to Axin2, a brake on the Wnt pathway; silencing Axin2 reduced berberine's effect on cell proliferation.

The study did not compare berberine directly with existing drug treatments, and the concentrations used were not translated into a human dose.

Hair follicle organoids and oxytocin signalling

In a 2026 Scientific Reports study, berberine was selected in a computer screen as a molecule that may bind the oxytocin receptor (OXTR) and tested at 2.5 µM in human dermal papilla cells and human hair follicle organoids. Expression of the hair-related genes Noggin and VEGFA increased, calcium oscillations consistent with OXTR signalling were seen, and elongation of hair peg-like sprouts was supported. The authors note the findings are limited to cells and organoids.

Androgenetic alopecia pathways

A 2025 computer (molecular docking) study suggested berberine may bind proteins linked to androgenetic alopecia. Such studies only generate hypotheses.

Intracellular and cell-to-cell communication

• Wnt/β-catenin: the main anagen-initiating signal, possibly influenced via Axin2.
• Noggin: a paracrine molecule that suppresses BMP signalling and lets the follicle leave the resting phase.
• VEGF: supports small blood vessels around the follicle during anagen.
• Oxytocin receptor and calcium signalling: a second-messenger system whose role in hair is newly being studied.
• AMPK and SIRT1: berberine's best-known intracellular targets, regulating energy balance and stress responses; their role in the follicle is supported only indirectly.

Chronic inflammation and the scalp

Low-grade inflammation around the follicle (micro-inflammation) can be seen even in androgenetic alopecia, and scalp conditions such as seborrhoeic dermatitis and psoriasis affect hair quality.

• NF-κB suppression: lower IL-6, TNF-α, COX-2 and iNOS.
• AMPK-mediated effect: blocking AMPK removed berberine's suppression of COX-2 and iNOS.
• Keratinocytes: reduced over-proliferation via JAK-STAT3 and CDC6 (2019); reduced keratinocyte pyroptosis via p38 MAPK/NF-κB in psoriasis models (2024).
• Atopic dermatitis model: fewer dermatitis-like findings in mice (2021).

There are no controlled human studies of berberine in scalp disease.

Oxidative stress

Reactive oxygen species from UV, smoking, pollution and ageing may contribute to early ageing of dermal papilla cells and a shorter anagen phase.

• Nrf2 activation: more HO-1 and NQO-1, higher glutathione and SOD.
• Lower NADPH oxidase: less ROS production at source.
• SIRT1/FOXO axis: indirect support for antioxidant enzymes.
• UV damage in skin: suppressed UV-induced MMP-1 and prevented loss of type 1 collagen in human dermal fibroblasts (2008).

Metabolic and hormonal axis

Hair loss can be linked to insulin resistance, metabolic syndrome and, in women, PCOS. In a randomised placebo-controlled trial in insulin-resistant women with PCOS (2012; 89 women; 500 mg three times daily; 3 months), berberine lowered total testosterone and the free androgen index to a similar degree as metformin and raised SHBG more. All participants also took a hormonal contraceptive and hair loss was not measured, so any effect on hair is indirect.

Level of evidence

Safety

• Digestive side effects such as constipation, diarrhoea, bloating and cramps are common.
• Drug interactions: berberine can affect liver enzymes (CYP3A4, CYP2D6); medical review is needed with blood thinners, ciclosporin, some antidepressants and diabetes medicines (risk of low blood sugar).
• Pregnancy and breastfeeding: not recommended because of the risk of raised bilirubin in newborns.
• Find the cause first: iron deficiency, thyroid disease, rapid weight loss, PCOS, medicines and androgenetic alopecia need different treatment.

Conclusion: Berberine is an interesting molecule that may act on several hair-related pathways, but its effectiveness and dose for hair loss in humans are unknown. It should be seen as a candidate for research, not a substitute for proven treatments.