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>Do they work?
Only until you run out of hair at the back, a la Liam Neeson. That, and it's painstakingly slow, expensive, and a forever proposition, given hair-loss doesn't just stop.
If you want to know if anything "works", just see if it works / is availed by those who have no financial constraints. If they don't use it it / prove its efficacy, it's nothing but more kikery.