Back in the 17th century, men were told that coating their balding heads with chicken faeces would help them regain a full head of long glossy locks. While we might have moved on somewhat since then, we still don’t fully understand the science behind hair loss and hair regrowth and, unfortunately, there are still some very common myths about hair remedies that we are far too quick to believe. 
The trick about all of these hair-loss products and treatments is that they’ll stop working as soon as you stop using them. “They have to be ready for a lifetime commitment,” says Rieder. But, just like brushing your teeth, as long you keep on keeping on with the scientifically proven preventative treatments, those hairs on your head should be just fine.

Under normal conditions, scalp hairs live for about three years (the anagen, or growing, phase); they then enter the telogen, or resting, phase. During the three-month telogen period, the hair root shrivels up into a small "club," then the hair falls out. It is therefore normal to lose about 100 hairs every day, more of them on days when shampooing loosens the hairs that are ready to fall out. The body then replaces the hairs.
And though this treatment appears to be safe and somewhat effective, it’s hard to tell who will react well to this low-level light therapy, which is why the doctors I spoke with were hesitant to fully endorse it. “We’re not sure what the optimal power is, what the optimal wavelength is, we don’t even really know the mechanism of action of how this is working,” says Rieder. Plus, it doesn’t work on everyone. “There are subpopulations of patients who do respond to low-level laser light, but this is not easily predictable,” explains McMichael, though she adds that the risk of using the LaserComb is low.
Natural hair that is subjected to constant physical trauma from excessive brushing or combing, tight braids or ponytails, or extreme scratching or massage can cause hair at the temples to become weak and to stop growing to its normal length. Clean shaving, especially for men, can cause white bumps to appear on the area where the hair was shaved short, and at times can become infected with pus and leave permanent scarring, affecting hair growth.
"Others are taking hair follicles out of human scalp and growing them with dermal papilla cells," Cotsarelis says. "If they grow in culture, you might be able to recombine them with skin cells and form new follicles. This would let you expand the number of follicles you get for a hair transplant. This may not be that far off -- five to 10 years, maybe. There's very good evidence you will be able to do that."
Some hair loss can also result from the psychological condition trichotillomania. “People with this condition compulsively pull out their hair when they are stressed or even when they are concentrating, e.g. studying hard,” says Burg. “Sometimes the individual doesn’t know they are pulling their hair out, doing the activity absent-mindedly, and only notice once the bald patches appear.” Over time the hair follicles can become so damaged that they die and leave permanent bald patches. Find out why you shouldn’t pull out gray hairs either.
There is no hard and fast answer. With Regaine Extra Strength results may be seen after 8 weeks. Clinical studies have shown that for Regaine Regular Strength or Regaine Gel for men regrowth can occur as early as 16 weeks. But remember that everyone is different so you need to be patient. Studies suggest that Regaine should be tried for 6-12 months before deciding whether to continue.
×