I had been choosing between TIAM My Signature C Source  and  red serums. Finally I've chosen the red serum as I liked its ingredients more. This serum has an orange colour. It is a bit sticky after applying but then it absobs and doesn't leave any bad feeling on the skin. I don't think it's a problem because it must be used in the evening. It's better to keep this serum in the fridge. After using it for 2 weeks I can see my skin colour has become better. It doesn't irritate my skin and makes it brighter. I like using it. It makes my skin more beautiful.