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Vitamin A Question, Please help?

Ok, I'm 15 years old(male) and have bad night vision, and a bad immune system. I went to the doctor they said I have vitamin A defficiency. So My mom brought these Vitamin A 8000 IU softgels, High potency (Cvs Brand). I was wondering if I should take one a day. Or one every other day. Also are the store brand or the all natural vitamin A supplements better. Because If they are then should I return these store brand ones to get the all natural ones or are they the same? Thanks for the help