Here's why:
* Hair growth happens at the follicles: Hair growth is determined by factors like genetics, hormones, and overall health, all of which operate at the hair follicles beneath the scalp.
* Shampoo cleans the scalp and hair: Head and Shoulders, like other shampoos, primarily cleans the scalp and hair shaft. It removes oil, dirt, and dandruff.
* Dandruff control might indirectly help: In some cases, severe dandruff can cause scalp inflammation, which *might* hinder hair growth. By controlling dandruff, Head and Shoulders could create a healthier scalp environment. However, this is more about preventing a problem than actively promoting growth.
* No proven hair growth ingredients: Head and Shoulders does not contain ingredients known to directly stimulate hair growth (like minoxidil, for example).
In summary: While a healthy scalp is important for hair health, Head and Shoulders is primarily a dandruff-control shampoo and won't directly make your hair grow faster or longer.