Originally Posted by divadoll /img/forum/go_quote.gif
Quote: Originally Posted by Andi /img/forum/go_quote.gif
ins´t that a pretty low concentration of Vit C? I don´t know how well Vit C would improve the skintone at all to be honest. I´d just use it for it´s antioxidative effect and rely on other ingredients to improve my skin.
I did make one batch of serum with ascorbic acid, but since I didn´t know how long it would stay active at all I didn´t feel like making a new one every other day, so I just stopped.
I read that for tetra-c which is an ester C (vitamin c derivative) that 3% is the appropriate concentration in a serum. Tetra-c has a shelf life of 18 months where ascorbic acid last a few weeks before air or light gets to it and oxidizes.
ah I see! All those different kinds of Vit C, it´s pretty confusing if you´re new to it like I am.
How long have you been using this?