The affect of zinc on hairloss

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I have recently purchased a jar of high strength chelated zinc (15mg tablets). I have read in some places that this is bad for hairloss, others that its good. Some said that too much is bad, too little is bad.

I note that zinc is mentioned alot on this site. Does anyone know whether 15mg a day is good or bad for hairloss? If so do you have any scientific papers to back up your claims?