Biotin is a largely useless and unproven supplement widely used for hair/skin/nails. It can skew the results of some blood tests. If you take it, you need to be careful when undergoing bloodwork because for some tests, you need to stop taking Biotin ahead of the test to obtain valid results. In a nutshell, it is a waste of money. See if you can return it to Walgreens for a refund. Walgreens is usually good about this kind of things if you act fast.