Vitamin E supplements can be found in 2 different forms, although one form is superior to the other. Products such as WHITE-E contain a natural form of vitamin E known as d-alpha-tocopheryl. This natural form is fat soluble, readily absorbed and stored in the body prolonging the duration of effect.
The other form of vitamin E is a synthetic man-made substance known as dl-alpha-tocopheryl
(Note- the “dl” in front of the synthetic form). This form of vitamin E is water soluble and consequently not stored in the body; it is also not readily absorbed and contains fewer antioxidants than natural vitamin E.
Use caution when selecting a vitamin E supplement for your greyhound. Products that only state the vitamin content simply as “Vitamin E” usually contain the cheaper synthetic form of vitamin E.