I call this my moisturiser in a serum format. This B5 serum is an absolutely great moisturiser for my skin. I have oily combination skin and have been using this hydrating B5 serum for the past week every day on my face, neck and chest. I only need to use 2 drops and use my finger tips to massage it into my skin. It isn't a sticky or oily serum so suits my skin type. As a moisturiser it it keeping my skin hydrated and moisterised throughout the day. The main active ingredients in this serum is vitamin B5 and hyaluronic acid. I'm really pleased with the results from using this serum, it's a lovely format for a moisturiser and stops the dryness from forming, especially now that the weather is getting warmer which is when my skin becomes more dry.