Straight tea leaf is usually a non-issue. Flavored and blended tea is where it turns: flavor compounds are typically carried in ethanol, some blends use dairy or grape derivatives, and one production line runs dozens of blends back to back. That's the reason certified tea catalogs are always partial — even the good houses certify a subset. Both of these name their agency and publish which teas are covered.
Published July 2026 · Updated 7 Jul 2026
John Harney started blending in Salisbury, Connecticut in 1983; three generations of the family now run it out of Millerton, New York, where they blend and pack their own tea. Their certified teas are under KSA (Kosher Supervision of America) supervision, and they publish the certified selection as its own collection. Loose leaf, sachets, and a genuinely deep catalog.
Why it's worth findingA family house that blends and packs in its own Millerton plant controls the equipment, which is what a tea certification is really about.
See it at Harney & Sons →This seat's open on purpose — we won't pad the list to hit a number. If you ship real kosher tea direct, it's earned, not sold.
Add your brand →Straight unflavored leaf is generally accepted without it, since it's a dried plant and nothing is added. Certification earns its keep the moment the tea is flavored, blended with anything, decaffeinated, or run on shared equipment. If your habit is single-origin loose leaf, this is a small issue; if you drink Earl Grey and chai, it isn't.
Flavor compounds are usually dissolved in a carrier, and ethanol is the standard one. Some blends also carry dairy derivatives (creamy or chai-style blends), grape-derived acids, or colorings. Then there's the line itself: dozens of blends run through the same equipment, so a certifier is checking the sequence and cleaning as much as the recipe.
It can be. Decaffeination uses a solvent — CO2, ethyl acetate, or methylene chloride — and both the solvent and the plant doing the work fall under review. CO2 decaf is the cleanest process and generally the best-tasting, since it strips less flavor along with the caffeine. If decaf matters to you, look for CO2 on the label.
Loose leaf gives the leaves room to open, so you get more out of the same weight of tea, and whole-leaf grades hold flavor longer. Good silk or mesh sachets are close behind and much easier day to day. What you want to avoid is the flat paper bag full of dust and fannings, which brews fast, bitter, and flat regardless of who blended it.
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