Check out article, looks promising. It regenerates skin and hair in burns, right now it’s proven effective in pig trials, soon it’ll move to humans. (warning: some may find the images to be disturbing).
While of course it’s not a direct cure for hair loss I figure if they know how to regrow skin, perhaps they can take a patch from our scalp where permanent hair grows and use it to give us an endless supply of hair potentially.
If it can’t be used to fix balding, at least it can be used to heal permanent scars, I think that would pretty amazing on its own. Plus it might even help soldiers with severe injuries and burns.