This is because vitamin E is packed with anti-oxidants and will help to extend the shelf life of your shea butter.
How much longer will a shea butter last with the inclusion of vitamin E oil?
No one can really tell you because the vitamin E oil is just one factor impacting the shelf life. There are many other factors, e.g. the temperature, humidity and light where you store the butter plus the lifespan of the oils and butters that you are actually using to make the whipped butter.
I keep my shea butter in my bedroom where it is usually very cool and dark - I live in cold London. If you are in Jamaica your bedroom conditions will be different. If you keep it in a bathroom, again the conditions are different.
Ultimately though, I like to play around with different butter recipes so I only make a small batch each time. The six that you see in the DIY Whipped Butter recipes are just some of my recipes. I play around with fragrances sometimes, try different butter combinations and so on.
If you will be making just a small batch each time then shelf life is not a big issue. It is only an issue if you make whipped butters for sale and will therefore be making large batches that may only be used many months after you've made them.
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