I started using this product the day it arrived, which was probably around 11-12-18. Because of adverse reaction to a prescription Retin-A product, I have been very careful using this and haven't yet used it by itself. I started by mixing a small amount with my regular moisturizer and I am presently mixing it half and half. I would like to use it exclusively but because I have extremely dry skin, it would not be emollient enough for my skin. I have always had dry, sensitive skin but due to a medical condition, my skin became extremely dry starting last year. Having found a product that works for me in the Winter, I am not willing to give it up. In time, I may try one of Paula's moisturizers for very dry skin but for now, I am sticking to my combination of half my moisturizer and half the Resist with Retinol. I have been quite surprised at the way this has worked, at half-strength, to help to fade sun spots I have, which have been a major irritant - to me! The other surprise has been how a smile wrinkle I have has become less pronounced. That wrinkle doesn't bother me too much but no woman likes any wrinkle, if we're honest about it! :) I look forward to the Summer when my dry skin is usually less pronounced. I will then use this product as my major moisturizer over my serum and see if it's emollient enough for it. I am impressed by this product and would highly recommend it.