I've been using this serum for a month now and finally feel like I can give an accurate review. My skin is acne-prone and for the past three months I have had some pretty bad breakouts on my chin and cheeks along with a few very small zits on my forehead. I thought to try this product because I was looking for a light BHA that would not be too harsh and I liked the small ingredient list on this product. I had never used any Boots or Boots Expert products before so I was going out on a limb with this one. I use this morning and night right after my cleanser (Olay Foaming for Sensitive) and it is a thin clear substance that is more liquid than gel. I use one pump for my entire face and neck. It doesn't smell and it doesn't sting, which I find a plus. After 2 weeks of use, my forehead and cheek acne cleared up. I have gotten NO new breakouts on those parts of my face. Can I get a hallelujah!?!? However I am still having some chin breakouts... But no cysts since starting this product. It isn't a miracle product but it surely is helping. For my chin, I am starting a new BCP because I suspect my issues are hormonal. I will update if anything changes.