Tea is a drink, not a treatment. Nothing on PS Teas is medical advice, a diagnosis, or a recommendation to start, stop or change any medication or treatment.
What we publish
General, educational information about tea and health, with every claim pointing at a named source in a registry of 18 references, and language hedged to match how strong that evidence actually is. A finding from a systematic review is written differently from a single small trial, and both are written differently from traditional use.
We do not claim that any tea prevents, treats, diagnoses or cures any disease. Where a popular claim is not supported by good evidence, we say so on the page — including where saying so is commercially inconvenient for us.
Please talk to a clinician if
- You are pregnant or breastfeeding. Caffeine guidance is commonly capped around 200 mg a day, and several common herbs raise separate questions that have nothing to do with caffeine.
- You take prescription medication. Herbs and tea polyphenols do interact with drugs; a pharmacist can check this in minutes and will actually know.
- You are iron-deficient or anaemic. Tea polyphenols inhibit absorption of plant-source iron — timing matters.
- You are managing a diagnosed condition, or considering concentrated extracts rather than brewed tea. Extracts are a different risk profile from a cup of tea.
- You are giving herbal preparations to a child.
Two safety notes we repeat often
- Temperature. Drinking beverages hotter than about 65 °C is classified as probably carcinogenic to the oesophagus. That is a finding about heat rather than about tea. Let the cup cool for a few minutes.
- Extracts are not tea. Rare reports of liver injury associated with concentrated green tea extract do not transfer to brewed tea, and clinical results obtained with a standardised extract do not transfer to a teabag. We keep those separate; much of the internet does not.
Our sources
Every citation is listed on the page where it is used, with a direct link, the year, and a strength tag. Sources are periodically re-checked; if you find one that does not support the claim we attached to it, tell us and we will correct it and say that we did. See how reviews are researched.