All of them are effective. A few dollars, dozens of dollars and hundreds of dollars all have their effects, but it depends on your own ability to get what you want. Amway's natural vitamin E works well. Take a look at Yangshengtang and say nothing else. Know how to recognize the effect. Think about the source of vitamin E. Wheat germ contains the most vitamin E, but where does the world get so much wheat germ oil? How to save it? The nature of vitamin E is unstable and easy to lose, and the preserved materials are a big problem. Merchants can't do unprofitable things, so they weigh the so-called "effect".