Good product! I gave it 4 stars because it ...
Good product!  I gave it 4 stars because it has a medicinal smell - probably because it has salicytic acid.  Therefore, I can only use it at night. I had to purchase this product because Amazon doesn't carry the 2.5% Retinol wrinkle serum (Phytosil brand) anymore.  :( So, this one was the closest to the ingredients of the one I prefer.  I hope Phytosil doesn't discontinue any of their facial products.
Rating: 4 stars