The best common sense rule of thumb for skin care and beauty routine products is this: if it isn't safe to go IN your body (i.e. you wouldn't eat it) it isn't safe to go ON your body (good taste is optional). That said, please do not taste all of your products to see if they make you sick! Luckily, there are ways to make smart purchasing decisions so your routine is comprised of products you AND your skin love (and the environment, too!).