To add to this:
Dr. Higgins: Yeah, with Androgenetic Alopecia you do get to the point of no return where you can’t go back. That’s why it is different from alopecia areata.
Dr. Hoffman: He said that he thinks there is point of no return in androgenetic alopecia. That means that after some time you can’t regrow hair.
Cotsarelis says that in gauging future prospects for alopecia treatment, it’s important to have realistic expectations. “I’d hate to use the word cure,
because I don’t think male-pattern baldness can be completely reversed,” he says. “Instead, we’ll develop different treatments, and as with other personalized therapies in medicine, some will work better in various subgroups than others.”
Domyati et al 2009:
Over time, thickening of perifollicular sheath takes place due to increased deposition of collagen, resulting in marked perifollicular fibrosis, and
sometimes ends by complete destruction of the affected follicles in advanced cases.
Olsen 2003:
"The end result is the production of smaller, unpigmented vellus hairs instead of larger, pigmented terminal hairs. Although the follicles do progressively get smaller,
the overall scalp follicle density appears to be preserved until late in the course of hair loss when follicles are eventually destroyed (for a thorough description, see Olsen, 2003)."
Sinclair 2016:
The proximal APM attachment was observed to be lost or extremely miniaturized in androgenic alopecia. The unique shape, location, and attachment sites of the APM suggest a significant role for this muscle in maintaining follicular integrity. Proximally, the APM encircles the follicular unit and only attaches to the primary hair follicle in the bulge;
this attachment is lost in irreversible hair loss.
ETC..