A 2020 database reviewTrusted Source of epidemiological and experimental studies in humans produced inconsistent results as well as limited evidence of the benefit of green tea consumption for lowering the risk of cancer. The researchers assessed 142 completed studies, including 1.1 million participants.
However, the topical application of green tea polyphenol extracts may have a role in protecting the skin from UVB radiation. A 2018 reviewTrusted Source of in vitro, in vivo, and human studies demonstrated the potential benefits of tea polyphenols in the chemoprevention of UVB-induced skin cancer.