I took this (along with a few other supplements) to address my sun sensitivity. I freckle easily and have a hard time getting tan. To be perfectly honest I don't really know if it worked, and if it did, which product worked. I did like taking it, country life is a solid brand. I definitely prefer buying my products from iherb compared to the other soul crushing delivery machine that starts with an A and is named after a forest. Fast shipping and reliable communication.