I love this product! I have sensitive, oily to combination skin and I'm in my 30's, so I'm looking for brightening and anti-ageing. The  ingredients in this product are awesome - it has several types of peptides, including palmitoyl pentapeptide-4, which has a good amount of scientific research behind it about increasing collagen production, as well a copper peptide which is usually really expensive. The serum is slightly thicker than water and is unscented. It absorbs really quickly and is not sticky at all. I apply this as a fourth step after cleansers, toner and essence. It spreads nicely and I'm guessing that the little bottle is going to last for 3-6 months. I've had no issues with allergic reactions, even on my under eye area, which is really sensitive. I'm not expecting overnight results with this as collagen production is a longer-term thing, but so far I like the serum and will definitely continue to use it twice daily in my routine. As a bonus, the glass bottle is really pretty and feels good quality. I've included a sheet mask for scale in the photo!