I've been using the Caramel Collagen Creamer for a little over a month now. I noticed a boost in my energy level immediately after I started using the product in my coffee every morning. The flavor is good but very mild so I still have to use my regular liquid creamer for full flavor, but I'm ok with that. In the last week I've started to notice a change in my skin. The tone is more even, I don't feel as dry, and there is a more youthful glow to my face overall. I am a chronic nail biter so I haven't noticed much with nails, and I haven't paid much attention to my hair. Overall, the benefits to my skin so far and the energy boost make this product worth a reorder for me.