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What vitamin deficiency other then iron,could cause hairloss in a young woman?

Im 23 and ive been dealing with diffuse hairloss for over 8 months...I believe it may have been started when i was anorexic, i started taking wonmans one a day which is high in iron and other stuff...how long will it take to kick in ? Is there other vitamin deficiencys that can lead to hairloss?