In tissue cultures, caffeic acid inhibits the development of human breast cancer cells, and of melanoma skin cancer cells. Many different studies have confirmed this response to caffeic acid. The medical journal, Cancer Research, has proposed that the caffeic acids in propolis could even help to prevent colon cancer, because in experiments, propolis stopped the formation of cancerous growths in rats which had been exposed to carcinogens. Much study continues to be done with caffeic acid and propolis.
Propolis contains flavonoids, which are protective against heart disease and cancer
Flavonoids are complex chemicals which found in fruit, tea, soy and propolis. Flavonoids are responsible for the colours of plants, and are antioxidants which protect plants from harmful free radicals. Flavonoids are a huge mix of chemicals, much more complex than vitamins. They've been studied because foods containing flavonoids are protective against illnesses like heart disease and cancer.
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