Wondering whether your shampoo has gone bad probably doesn’t feature high on your list of health concerns. As shampoo is frequently used on a daily basis, a bottle isn’t usually left open or unused long enough for this to be of any concern. But what if you find an old bottle of shampoo buried away in an old suitcase for instance? Will it still be safe to use? For this reason shampoo does have a shelf life, albeit a long one and some shampoos also have an expiry date. Read here for the full article does shampoo have an expiration date?