Each and every year, there are multiple new skin care brands entering an already-overcrowded space. Many try to garner attention by touting a new, magic ingredient and others by attacking established, scientifically proven ingredients.
A simple truth that sets the stage for separating ingredient fact from fiction: It is the dose of an ingredient, more than the ingredient itself, that determines toxicity. A related corollary is that the form of an ingredient can affect its efficacy, as well as whether or not it is potentially toxic.
Is it fair to say water is a nontoxic ingredient? Yes; however, if you ingest too much water, it can have a deadly effect. You can draw the same conclusions on a plethora of ingredients.