In detail

EGCG is one of the catechins in green tea and the usual marker for green tea extract. A 98% polyphenol / 50% EGCG grade is common, but the calculation basis (as-is or dry) and the caffeine content both matter. Decaffeinated grades are available and should state the residual caffeine level.

High-dose green tea catechins have been the subject of liver-safety discussions in some markets. That is a finished-product and regulatory question, not a reason to avoid the ingredient, but it belongs in the market review. The supplier's job is to provide accurate EGCG and caffeine values and the method behind them.

Why it matters to a buyer

  • EGCG is the label marker for most green tea extract products.
  • Caffeine content affects positioning, taste, and market restrictions.
  • Calculation basis changes the apparent percentage.

What to ask a supplier

01

Is the EGCG result as-is or on a dry basis?

02

What is the caffeine content, and is a decaffeinated grade available?

03

Which HPLC method and reference standard were used?

Cite this page

Rainwood Botanical. "EGCG." Botanical extract glossary, October 2026. https://ingredients.rainwoodbio.com/resources/glossary/egcg/