Well, i personally have dark lips and they are improving. I am an african american woman, who after have a rash on my lips, they turned dark. i researched online and found a product called freshup. go to that website and you will see the product. it says that you will see results in 7 days. and sure enough, i saw results in 7 days. it does work although it is expensive, but well worth the price. also, something that i found to work was using a toothbrush, dip it in lemon juice and honey and lightly scrub. do that every night and you should see it lighten. lemon juice is a natural acidic. remember to use a very mostririzing chapstick afterwards.