It can be harmful if used too often, like as a substitute to normal bar soap or body washes which mainly wash away dead skin, oil, sweat and dirt build up. Not only does antibacterial soap wipe out the above and bad bacteria, but it also wipes out bacteria that your body is used to having around, like the little ones that live off of consuming dead skin cells. If we don't have these bacterias/germs on our body then the dead skin flakes can build up and even get into little cuts that we may have and this can lead to fungal infections. Any way, antibacterial soap is great to use on new cuts, new piercings, hands that have just been exposed to raw meat, urine, fecal matter, ect. to remove the potentially harmful bacteria that you just came into contact with, but it should be used sparingly and should not be substituted for regular soap or body wash for regular bathing.