Theaflavin is a polyphenolic flavonoid that has been found in black tea and has diverse biological activities, including antioxidant, anticancer, anti-inflammatory, and antiviral properties

Theaflavin-3-gallate (Theaflavine-3-Gallate) can play a role in decreased intestinal cholesterol absorption via inhibition of micelle formation. Theaflavin-3-gallate has anticancer and apoptotic effects in non-small cell lung carcinoma, it acts as prooxidants and induce oxidative stress, with carcinoma cells more sensitive than normal fibroblasts.

1. Theaflavine-3,3'-digallate (theaflavin digallate) and lactic acid together could reduce herpes simplex virus transmission.

Theaflavin 3,3'-digallate (8-Gingerol) , a major polyphenol found in black tea, is an inducer of oxidative stress which has anti-inflammatory and cancer chemopreventive actions, it reduces tumor angiogenesis by downregulating HIF-1αand VEGF.

Theaflavin-3'-Gallate (Theaflavin 2B) usually comes from the leaves of Camellia sinensis (L.) O. Kuntze. Theaflavin-3'-gallate, act as prooxidants and induce oxidative stress, with carcinoma cells more sensitive than normal fibroblasts.

Isotheaflavin is a natural product.

Neotheaflavin, from black tea, inhibits pancreatic lipase.