If you're not sure to spend a lot for new products, this is the best opportunity to try 2 treatments at the affordable price (yup, it's more conveniente, I've counted!). After 1 month of using this DUO I'll definitely come back to buy its full versions (though I really love travel and deluxe sizes for its compactness and a possibility to have always fresh products!!!). The bigger one, with Retinol (which is strange, cause it supposed to cost more and I'd rather expect the producer to give me the expensive product smaller) is great for overnight treatment. Just be patient! It's real effect will be visible with time, a lot of time! You should wait at least a month to notice your complexion became better in and the fine lines almost disappear! Retinol is also one of the best for acne-prone skin! The smaller treatment is great for both, AM and PM. It contains Vitamin C and clears dark spots (but remember to use your SPF!!) Both are just great on skin - no sticky residues, no allergies, no break-outs. The Vit C treatment makes your skin really glowy!