I found out quickly how effective Tropicsport is. My first application was too heavy. Figured it out quickly, only a small amount is needed and it lasts a long time. The bottle will last me a long time, also does not need to be applied as often as others, not to mention environmental friendly. Glad I discovered it, would highly recommend. I go to the dermatologist every 3 months, just what I have been looking for. Very happy!