Turns yellow after oxidization over a long period of time. Not sure why and i realise im not alone on this. I use it only at night. Stings a little, and a little on the sticky side. Recommend to use it with other liquid products so that it's less sticky. However i will keep using it because it seems like the best vitamin c vegan option amd i feel that it works in brightening my face. So yes, i will continue using! 😉