I liked yesterday's lotion and I really liked last week's lotion with Aristoflex AVC. But there are more experiments to be done, so let's take a look at a Vitamin C and ferulic acid serum made with this new emulsifier!
The main ingredients in this recipe are ferulic acid and Vitamin C, a combination that is purported to do all kinds of lovely things for our skin. It is the combination found in a very expensive serum, and I think it's one of the things that DIYers try when they learn about making products.
Ferulic acid is a polyphenol that offers good anti-oxidizing properties that can moisturize skin, help with light and weather damage, and might help tone down age spots. It might help stabilize Vitamin C (l-ascorbic acid) in our products. It should be good for protection against skin cancer and wrinkles and age spots caused by sun exposure because it protects against oxidative stress. It isn't cheap - 1 gram goes for $2.95 at Lotioncrafter - but we only use a titch in a product at around 0.5%.
Ferulic acid isn't very soluble, so we have to mix it into propylene glycol or glycerin before adding it to the product. Mix it very well, then add it to the lotion or other product you're making.
I'm adding the glycerin as it's a great humectant, but also a vehicle for dissolving the ferulic acid. I'm not using propylene glycol, even though it's more effective, because I don't have any. If I did, I'd use it in this recipe at 3% or so.
MAP liposome - Magnesium ascorbyl phosphate, INCI Water & Phospholipids & Magnesium Ascorbyl Phosphate, from the Formulator Sample Shop - is an oil soluble Vitamin C product that we can add to our products. I've used it like an oil in this recipe. It has been proven in studies to be an anti-inflammatory that can stimulate collagen formation, lighten skin, treat hyperpigmentation, and heal wounds. Vitamin C is a very unstable ingredient - you can't just get some ascorbic acid and put it into the water phase of something ...