I got this product by requesting a trial sample of the endure system. It automatically popped up as a suggested product (just pay separate shipping) - and it is meant to apply over the endure products (which included a night cream, eye cream and retinol bottle)
Using the whole system, sporadically, I have noticed a difference in my skin - including some shrinking of brown spots. And this is on a guys face! Imagine it working on a woman's skin!