Water-soluble green tea extract: beverage powder and topical liquid are not interchangeable

Two listings can carry the same words — water-soluble green tea extract — and still describe different materials. One arrives as a dry powder priced against laboratory assay values; the other is an extract already dissolved in water and glycerin, priced against the percentage used in a formula. Confirm which of the two is on offer before comparing specification and price, because the paperwork you need, and the mistakes you can make, differ for each.

Six points to compare before the price

Scroll the table horizontally; focus the table region and use the arrow keys.

Comparison point	Oral (food and supplement) powder	External-use liquid
What arrives	Powder as supplied (a sample listing titled “Green Tea Extract Powder”[3]); listed pack variants run from 100 grams to 25 kilograms[2]	A liquid that blends in as supplied: glycerin, water and leaf extract with sodium benzoate and potassium sorbate[1]
Carrier	Assay applies to the powder itself; the same listing states that it contains no fillers, additives or anti-caking agents[3]	Water and glycerin: carrier declared as glycerin, application declared as topical[5]; another sample lists the extract in water and glycerin 50/50[4]
How the number is given	Content values with a method: total polyphenols, catechins with EGCG stated as a share of them, and a caffeine ceiling, each assayed on a stated basis[3]	Use level or declared status: typical use level 0.1–2%[4]; typically used at 0.5% to 5% in formulas[1]; one sample is declared non-standardized and full spectrum[5]
Intended use and rule path	Oral: the Canadian natural-health-product monograph gives the route of administration as oral, and its own text states that it excludes foods or food-like dosage forms[6]; label directions on the sample read as a dietary supplement[3]	Both liquid samples state for external use only[1][4]; whether a finished product is a cosmetic or a drug follows its intended use[8]
Finished products	Ready-to-drink tea[7], instant tea powders (listed in this supplier’s green tea range) and capsules[3]; beverage projects record EGCG and total catechin content per serving[7]	Facial toners, hydrating mists, sheet-mask serums and light gel moisturizers[5]; face masks, face soaps, lotions and creams[1]
What to request	Batch COA with the HPLC method, dry-basis or as-supplied reporting, carrier declaration, per-serving calculation	INCI and full composition, extract concentration against use level, preservative system, stability data, external-use statement

Why the two do not substitute

Both listings can carry the label “water soluble”, and that phrase describes how the material behaves in water. The powder’s figures come from laboratory testing of the dry material, and they travel with a method, a reporting basis and a carrier declaration. The liquid is already diluted in water and glycerin, so it is quoted by the percentage used in a formula, and one sample above declares itself non-standardized.[5] Carrying a powder’s EGCG figure into a liquid enquiry asks for a value nobody measured, while adding an external-use liquid to a beverage formula brings in a preservative system plus an external-use label statement: both liquid samples reviewed here state for external use only.[1][4]

Documentation is what settles the choice. For a powder, the assay and its reporting basis decide whether two offers describe the same material; for a liquid, composition, extract concentration beside the recommended use level, and the external-use statement decide whether it can go into your product at all. The wording on a specification sheet also needs a method behind it: a total-polyphenol colour value alone gives neither the EGCG fraction nor evidence about caffeine, which is why the reading rules for these numbers sit with the ingredient’s composition and testing research.Green tea composition and assay methods

What to request before you ask for a price

Name the destination market, the application format, and which of the two forms you mean. A beverage brief and a skincare brief start from different documents.
For a powder, request HPLC results for EGCG, total catechins and caffeine with the reporting basis stated, plus a carrier declaration and the batch COA for the offered lot.
For a liquid, request the INCI and full composition, the extract concentration beside the recommended use level, the preservative system, stability data and the external-use statement.
Keep the distinction between total polyphenols, individual catechins, EGCG and caffeine in view when setting marker priorities; constituents, applications and processing questions are covered in the green tea ingredient entry, and the commercial offer, grades and packing terms sit on the green tea extract procurement page.