I'm not really sure..I bought this when I went on a cruise to put on me to help get darker but I ended up having to have surgery so I wasn't out in the sun alot so it never got used. On the back of the bottles it says "This lightweight easy spray allows for all-over even coverage that goes on quickly, absorbs quickly, and doesn't leave skin feeling greasy.Locks in moisture to help keep your tan great looking! Help the sun love your skin more anywhere." What I took from this when I bought it is that it is an accelerator like baby oil would be when your trying to get dark. Hope this helps. :)