Histogen does work, check their website for pictures. They're on Phase 2 now which studies efficacy so most likely they'll get even better results. 2015 is their date.
Aderans - they had some "weak" regrowth pictures but that was a long time ago. They invested A LOT of money in this and they're conducting many studies at once. They said that they should have something by 2014....
Replicel - we don't know anything yet... They were extremely successful in mice but we'll see how they do it with humans in two months. 2015 also
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