Minoxidil works everywhere there's hair. However, IIRC in the original trials they only tested it on the vertex so companies can only claim it works there.
Does anyone have a good source (and not some random uncited article) for why vitamin C might be beneficial when combined with MSM? All I can find is a horse study on exercise induced oxidative stress.
This is my guess. There's another study with women that showed increased thickness. So I'm thinking it increases anagen and thickness of existing hairs. Which would still be pretty good for a cheap, safe supplement.
I've seen anecdotes about this but no good explanations. Perhaps its related to how modafinil affects dopamine. Dopamine agonists are known to cause hair loss. Or maybe its due to the increased histamine release. I don't know.
If you have androgenic alopecia, the hair will probably grow back but...