Welcome back to my quick fire questions serious. Today we are tackling Vitamin C oxidation and if you’re pondering this question I am going to take a wild guess and assume you’ve already researched and bought a Vitamin C product. Hence, I am not going to bore you with the benefits of Vitamin C and get straight to the point.
How do I know when my vitamin C is oxidised?
There are two ways: change of colour and lack of tingling when applying the product. If the serum was clear to begin with then it will turn to a brown or yellow colour when it has begun to degrade. However, as we know some vitamin c serums start off orange (like Drunk Elephants C-Firma) and while a colour change may occur it may not be as apparent to you.
In this instance I prefer to take note of how it feels on the skin. When applied to skin vitamin C should give you a slight tingling sensation and as it loses its efficacy it loses its tingle. This is how I determine whether it has oxidised or not.
Vitamin C oxidises very quickly once opened so it’s best to be consistent with use and a general rule is to try and finish the product within 3 months of opening.