 [ Symptoms ] hi my blood group is o  and i sucked few drops of a+ blood from my girl friends cut is this harmful for me  hi my girl friend accidentally got a small cut on her hand and i sucked that blood immediately it was just a few drops my blood group is o  and her blood group is a+ is this harmful for me if so what should i do now please do help me out with this thanks [ Disease ] it may not be necessary for you to take a multivitamin provided your diet is well rounded and you do not have any nutrient deficiencies that said any multivitamin that provides 100 of the rda of all the essential vitamins and minerals is best there is no specific formula necessary it is generally preferable to avoid a multivitamin with iron unless you are anemic talk to your health care provider or pharmacist to find the best multivitamin for you