Nutrients & foods

Botanicals & foods

Green Tea

A beverage from Camellia sinensis; concentrated extracts differ from brewed tea.

Updated September 17, 2026 · Educational reference

What it does

A beverage from Camellia sinensis; concentrated extracts differ from brewed tea.

What symptoms can—and cannot—tell you

There is no established dietary deficiency syndrome for this specific botanical or compound. Symptoms are not evidence that you need this supplement.

Food sources

Brewed green tea.

Supplement forms

Tea beverages and concentrated extracts differ substantially in caffeine and catechin exposure.

Before taking a supplement

Concentrated green-tea extracts have been linked to liver injury. Brewed tea and extracts differ; caffeine may affect sleep and medicines.

Questions for your visit

Could my diet, medicines, absorption or another condition explain my concern? What evidence would support treatment, and how would we check whether it helps?

Names you may see

Green Tea

Sources & perspective

This is an editorial adaptation of the Purser Wellness nutrient reference app. Purser teaching connections are labeled separately from clinical interpretation. Private cases and individual treatment protocols are not reproduced.

The external resource below explains supplement safety; it does not validate every proposed use of this ingredient.

NCCIH: Green TeaNCCIH: using dietary supplements wisely