HairTodayGoneTomorro: Only one way to find out: wait and see. It'll "normally" grow about half an inch or so per month. No practical way to know if it will all grow back. But it will stop shedding, unless something else is wrong. Plus good hair and scalp hygiene will help. And figuring out what caused the deficiency in the first place. And if you have any other deficiencies (e.g. biotin).
Answered 1/29/2017
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