I love this product! I use it under my moisturizer and makeup during the day and under my Anti-Wrinkle deep wrinkle serum at night. It has definitely helped my 56 year old skin - my friends have noticed the difference! It does work best if you apply it to clean skin first, wait until it absorbs and then add moisturwizer. It does make your skin seem tight when you apply it but that's where using moisturizer comes in. The combination of the two really helps me keep my skin looking great. The smell is Devine! I am a beauty product junkie (in all price categories) and for the money this is a great product. I've tried other hyaluronic acid/vitamin c serums and have found this one to be excellent.