I haven't used this too much because I've been struggling with overexfoliation, and this is a product that can be harsh on skin. With that said, I do love this product for hyperpigmentation! It also evens out skintone very well and gives a nice glow. It comes in a dark bottle, and a dropper comes separate with it. This is a good thing so that oxidization can be prevented. I've had my bottle now for about a month, and I have not noticed any oxidizing. I keep mine in the box inside my fridge. When the product is cool, it gives a refreshing feeling on my face as a bonus. :)