I've been wearing this with my moisturizer every day and I have a really nice glowing tan. You can add 1 to 12 drops of this serum to your favorite moisturizer, lotion, oil or butter. It takes approximately 4 to 6 hours to activate and you get a really rich color. The more drops you add the darker you will be. The one thing I love is it doesn't have that "tanning cream smell" The boxes came to me slightly damaged, but the serum is in a glass container, new, never opened. Use year around!