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Although advocates claim that hair naturally adapts and regulates oil levels, there is no evidence to support the idea and stopping using shampoo can cause scalp problems.
A growing trend on social media encouraging people to stop using shampoo may be put scalp health at risk. According to experts, the practice can lead to hair weakening and the premature appearance of gray hair.
Known online as “#nopoo“, the “hair training” movement has gained traction among younger users, particularly Gen Z, with influencers claiming that avoiding shampoo allows the scalp to regulate itself naturally. Proponents argue that over time, hair produces less oil and becomes healthier without frequent washing.
@beingwellishot ALSO stylying tools on COOL help style it when wet #noshampoo #nontoxic #lowtox #nopoo #haircare #holistichealth #holisticbeauty #womenshealth #wellness #healthcoaching #fyp ♬ original sound – Beingwellishot
However, experts warn that these claims are not supported by scientific evidence. On the contrary, failing to wash your hair regularly can create conditions that harm both the scalp and hair.
One of the most persistent myths behind this trend is that frequent washing causes hair loss. Experts say this is not true and that, in fact, inadequate cleansing can contribute to the worsening of hair problems, including androgenetic alopecia, the most common form of hair loss.
A key factor is the accumulation of sebum, the natural oil produced by the scalp. Although sebum plays a protective role, excessive accumulation can retain dihydrotestosterone (DHT), a hormone associated with the reduction of hair follicles. This can result in thinner, shorter, and less pigmented hair over time.
Furthermore, inadequate scalp hygiene can unbalance the microbiota, leading to the proliferation of bacteria and fungi. Research in the journal Skin Appendage Disorders indicates that these imbalances can worsen follicle health and contribute to inflammation. Symptoms often include itching, flaking and the build-up of a rough layer around the hair follicles.
This buildup — made up of dead skin cells, oxidized oils, and microbial growth — can suffocate follicles and stunt hair growth. Even in the early stages of hair loss, studies in the Journal of Investigative Dermatology found chronic, low-grade inflammation around follicles, which can further disrupt the hair growth cycle.
Experts also dispute concerns about sulfates, which are the most common cleaning agents in shampoos. Although sulfates can cause dryness or irritation in some sensitives, there is no evidence linking them to hair loss or damage to hair follicles.
Ultimately, dermatologists stress that keeping your scalp clean is essential for hair health. Although washing frequency may vary depending on hair type and lifestyle, completely abandoning shampoo can do more harm than good, compromising scalp health and accelerating unwanted hair changes.
