Providone is simply iodine with a buffering agent to reduce the painfull stinging of topical applications.There are two percentage strengths.One is for surgical pre op scrubbing and the stronger for actual wound care.You can find these in larger quantities through equestrian or pet resources at much cheaper prices.The amounts needed for purification will not cause internal harm.A more usefull product, Potassium permanganate is harder to acquire(it has been the subject of past posts). I may be on to some veterinary sources and will post if successful .<br><br>