We end up stocking tonnes of skincare products for our various skin concerns. But, like everything else, they come with an expiry date, too. However, is the expiry date the only marker for you to determine if your beloved serum or moisture has gone bad, or is there more? According to an expert, while the expiry date imprinted on the wrapper is one of the most crucial determinants of the shelf life of skincare products, it’s not the only…