Oxidative stress or the presence of free radicals can cause many types of cancer. These molecules affect healthy cells by inhibiting their ability to regenerate. They also block the production of new, healthy cells and encourage the growth of cancerous cells and tumors. The antioxidant properties of astragalus impede free radical development. Phytochemicals in the herb are especially known for their ability to ward off or reduce the spread of certain cancers, such as liver cancer.

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