Can shampoo promote hair growth?

Generally speaking, shampoo itself cannot promote hair regrowth. However, under medical guidance, using shampoos containing specific active ingredients may help alleviate scalp problems associated with hair loss to some extent, thereby creating a favorable environment for subsequent treatments. Detailed analysis is as follows:

Everyday cleansing products primarily rely on surfactants to remove oil and dandruff, having minimal impact on the biological processes deep within hair follicles. If hair loss is caused by seborrheic dermatitis or excessive proliferation of Malassezia fungi on the scalp, medicated shampoos containing ketoconazole, selenium sulfide, or salicylic acid can inhibit fungal growth and reduce redness and itching, indirectly minimizing hair breakage due to scratching and inflammation. Plant-derived active ingredients such as caffeine and saw palmetto extract may temporarily counteract the inhibitory effects of androgens on hair follicles. However, current evidence supporting their efficacy is limited, and any minor benefits would require several months of continuous use. These ingredients cannot replace standard medical treatments.

The key to achieving actual hair regrowth lies in comprehensive interventions targeting the underlying cause. For androgenetic alopecia, oral finasteride and topical minoxidil are considered the gold-standard treatments; alopecia areata often requires local corticosteroid injections or immunomodulatory therapy; individuals with nutritional deficiencies should, after medical evaluation, supplement protein, essential amino acids, and micronutrients accordingly. Shampoos can only serve as adjuncts—they cannot replace the above therapies, nor can they replicate the follicular redistribution achieved through hair transplantation surgery.

It is advisable in daily life to reduce the frequency of high-heat blow-drying and chemical hair treatments such as perming and dyeing, and to avoid hairstyles that exert excessive tension on the hair. A balanced diet rich in fish, eggs, lean meat, and dairy products helps support hair health. When necessary, vitamin B complex and zinc supplements may be taken under professional supervision. If daily hair shedding consistently exceeds 100 strands or noticeable thinning at the crown has persisted for more than three months, it is recommended to seek early evaluation from a dermatologist, including trichoscopy and laboratory tests, to establish an individualized treatment plan and prevent delays in appropriate care.