Vitamin E is a type of fat-soluble vitamin , including four tocopherols and four tocotrienols , and is an antioxidant .
Vitamin E was discovered as early as the 1920s. Evans and his colleagues discovered during their research on the reproduction process that rancid lard can cause infertility in rats .
In 1922, foreign experts discovered that a fat-soluble dietary factor is essential for the normal breeding of rats .
This factor was named vitamin E in 1924 .
The crystals were isolated in 1936
It was artificially synthesized by Swiss chemists in 1938 .
Account not verified