The ones I buy are called Elu-Sun
I have a naturally fair complexion, I started taking these (4 a day) before I went to California a few months ago because I wanted a nice tan and I needed all the help I could get. (I was also going to the tanning salon, went like 10 times in the two weeks prior to my trip)
I've tanned before in the machines and never got as brown as I did this time taking those pills at the same time. They really work. I was told not to overdo it because I've heard rumors about them turning the whites of your eyes yellow but nothing like that happened to me. I got mine at a health food store.