There are plenty of vitamin E supplements on the market. You can find one practically anywhere you look. But the vast majority of them use soy as their source of vitamin E. So when looking for a good alternative, Dr Mercola wanted to not only avoid soy but also wanted to make sure whatever natural source of vitamin E was used was not genetically engineered (GE). That's why Dr Mercola decided to use sunflowers for the source of vitamin E. They are an excellent natural source of vitamin E.