by Christine
(UK)
I have read that when oils are purchased, their shelf life can be extended by adding Vit E, which will help slow down the oxidation process. What is the rule of thumb percentage for this?
"While the alpha tocopherol in the 250, 1000, and 1400IU/g oils is wonderful as an in vitro antioxidant, studies show that the gamma tocopherol in the Vitamin E T-50 oil is a better antioxidant for oils/lipids in cosmetic formulations. T-50 has a higher content of gamma tocopherols and can be used at a rate of .04% or 400ppm to adequately protect your oils."Hope that helps,