According to the search results, low testosterone levels do not directly cause hair loss. Hair loss is associated with the sensitivity of hair follicles, which is genetically determined. However, increased testosterone levels in women can cause hair loss on the crown of the head if they have more sensitive hair follicles. Testosterone is responsible for secondary hair growth in men, and a body lacking in proper testosterone levels may suffer from various problems, including hair loss. The relationship between testosterone and hair growth is complicated, and high levels of testosterone do not necessarily cause hair loss. The sensitivity of hair follicles to dihydrotestosterone (DHT), a byproduct of testosterone, is what causes hair loss. If hair follicles are more sensitive to DHT due to a genetic predisposition, higher levels of DHT or testosterone injections may lead to hair loss. However, taking testosterone does not mean that an individual will definitely experience hair loss.
In summary, low testosterone levels do not directly cause hair loss, but the sensitivity of hair follicles to DHT, which is a byproduct of testosterone, can cause hair loss. The relationship between testosterone and hair growth is complicated, and high levels of testosterone do not necessarily cause hair loss.