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Insights

The ingredient notebook.

Practical comparisons, specification guides and buying decisions—with sources you can inspect.

Selected catechin measurements in an external NIST green tea reference material
Evidence & purchasing decisions

Green tea extract specifications: EGCG, catechins and the assay basis

Use NIST green tea measurements to compare EGCG, catechins and assay basis. Includes uncertainty data and questions for a bulk ingredient sourcing brief.

Read the guide and inspect the data →

External source data · Original chart · Technical review pending

5 guides
A clear evidence standard

Sources, methods
and useful limitations.

Guides separate published findings from editorial analysis and illustrative calculations. No borrowed experiments are presented as our own.

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