I have worked on these for a bit and here is my experience. Keep in mind I am no pro and I am still learning new things every day. First off the Vitamin E is to mainly prolong the shelf life and look good on the label in my IMO . I have tried using f/o, vit e, polysorbate 20 and jojoba oil and some fos still end up seperating. Now I just add jojoba and fo. I havent had any problems YET!!! lol. I only use fos that are stated to be skin safe. HTH