Est. 1956 · The Order The independent guide to oolong: the partly oxidized teas, and how to brew them. Oolong.biz
THE ORDER OF THE SEVENTH STEEP SEMPER PARTIM OXIDATUM The Order of the Seventh Steep
The Order of the Seventh Steep
OOLONG
Semper Partim Oxidatum Always partly oxidized

Tagged: clinical trial

Article · Health & Science

The 1987 Paper That Invented GABA Oolong Was About Blood Pressure

The tea sold today for stress relief and better sleep began as a 1987 Japanese food-science paper aimed at hypertension. That claim has real, if modest, human trial evidence behind it. The calm claim now on the label rests on thinner proof, and on a molecule no human study has shown reaches the brain at all.

Jul 10, 2026
Article · Health & Science

The oolong weight-loss trials measured hours of fat-burning, not pounds

No systematic review of oolong and weight loss exists, only two small human trials. Here is what those trials, and the closest systematic review that does exist (green tea's), actually measured, in kilograms, not adjectives.

Jun 17, 2026
Article · Health & Science

The Oolong Diabetes Trial Everyone Cites Had One Funder

A 2003 trial found oolong tea cut blood sugar by nearly a third in diabetic patients. It was run by a beverage maker's own research lab, the one independent repeat found nothing, and a large cohort found the opposite. Here is what actually holds up.

Apr 10, 2026
Guide · Health & Science

Oolong and the Clinical Trial

The evidence behind oolong's health claims runs from a 76,979-person cohort to a 20-person industry-run crossover, and the two are not the same kind of proof. The Order's standing method for reading a trial before trusting it: sample size, funding, statistical versus practical significance, and how much a single study should ever be allowed to settle a question.

Guide · Health & Science

Oolong and Health

What the published research on oolong tea actually measures, not what the label copy claims. The trial and cohort evidence on the heart, blood sugar, weight, and bone, how partial oxidation changes the chemistry those trials test, and how to read a small positive trial against a large null one.