Alpha - carotene has proven that it could suppress the lung cancer, liver cancer and skin cancer. There are at least 600 kind of natural carotenes found, however some of them (for example Beta - carotene and so on) can transform in vivo into Vitamin A. As we know, pumpkin and carrot consist not only Beta - carotene, they also includes the massive Alpha - carotene. Even though Alpha - carotene is structurally different with Beta - carotene, but its anticancer treatment effect is much more effective than Beta - carotene. It's clear that Alpha - carotene is effective in anticancer treatment, and its resistance skin cancer's effect is also very obvious. This has proven that Alpha carotene, in cancer prevention is indispensable.