Is it okay to take biotin, iron and a multi vitamin daily?

Yes but why iron?: This is safe in terms of not having excessive doses of any but few men need to take iron- iron is a pro-oxidant. Other than young children, i only advise iron supplements to menstruating women. Generally men can get adequate iron from diet and excess iron intake increases risk of heart disease and cancer so unless you know you are deficient in iron i would not supplement with it!