Theaflavins — The Black Tea Polyphenols

Theaflavins are potent polyphenols that exert their effects through multiple cellular pathways, notably by activating AMPK and modulating the gut microbiome. They possess strong antioxidant properties and regulate genes that produce inflammatory cytokines, thereby combating chronic inflammation. In cellular models, theaflavins have been shown to downregulate the ratio of pro-apoptotic to anti-apoptotic proteins (Bax/Bcl-2) and suppress the aryl hydrocarbon receptor. These mechanisms collectively contribute to improved metabolic regulation and cellular protection against oxidative stress.

Human evidence for theaflavins primarily focuses on metabolic health and body composition rather than direct longevity endpoints. A randomized pilot study demonstrated that oral theaflavin administration decreased body weight and body fat percentage in healthy subjects. No published human longevity trials exist; lifespan extension data is currently limited to animal models such as Drosophila.

Typical doses range from 100–500 mg per day, often taken as part of a standardized black tea extract. It is generally consumed with or without food, though taking it away from iron-containing meals is advised due to potential absorption interference. Optimal dosing for longevity purposes remains unestablished in humans.

Theaflavins are generally well-tolerated with a safety profile similar to black tea consumption. High doses may cause mild gastrointestinal discomfort or interfere with the absorption of non-heme iron. Long-term safety of high-dose isolated theaflavin supplementation is not fully established. Individuals sensitive to caffeine should ensure they are using decaffeinated extracts if taken in large amounts.

Key Papers