It’s pretty much a no-brainer when it comes to making natural soap.
Vitamin E (alpha-tocopherol) is one nutrient that has been proven in scientific studies to actually permeate both the epidermis and the dermis when applied topically, even when rinsed off, as in a soap. To take advantage of this action, we add it to our soaps in oil form. 
Smooth your relationship with your face
As an oil, Vitamin E helps protect the skin by adding to its barrier function at the stratum corneum (the top layer of the epidermis). Once there, it smooths the way against redness, irritations and other hypersensitivities caused by your inner stress and the outer environment. Then, it sinks even deeper where it has also been shown to be photoprotective, helping guard skin against free radicals due to exposure from the sun that cause skin aging and skin cancer. What’s more, Vitamin E may decrease wrinkle formation and enhance skin’s immune system.
Keeps our soap fresh
In addition, Vitamin E oil is a natural preservative when added to a skin preparation because it helps prevents oxidation. Since we shun parabens (chemical preservatives of questionable safety) in our natural soaps, we add Vitamin E oil to keep soaps from spoiling and prolong it’s shelf-life.
Couldn’t your skin use a boost of nutrition from the outside?