Tea traditions and health beliefs: how to read the evidence
A deeper guide to cultural tea traditions, present-day wellness beliefs and what clinical research actually establishes.
Read the guideUnderstand your cup
Tea Notes. Real answers, good cups.
Tea Notes is OngTeh’s growing, research-aware library about better tea choices. Start with a question, follow the evidence, and enjoy the drink for what it is—without miracle claims.
Sleep & winding down
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Understand the basics
Start with what a tea actually is.
True tea, herbal infusion, decaf and caffeinated plants are different. Understanding the ingredient is a better foundation than choosing a drink because it promises a cure.
Explore the 101-entry Tea Atlas ↗
AI-generated editorial image; not botanical identification.
Which tea is best before bed? A caffeine-first guide
Which tea should you drink before bed? Compare caffeine-free choices, chamomile evidence and a practical evening routine without sleep-cure promises.
Read the guideCaffeine, tea and sleep: when should the last cup be?
How tea caffeine may affect sleep, why sensitivity varies and how to choose an evening drink without misleading rules.
Read the guideTea for stress and relaxation: the value of a quiet ritual
Explore calm tea rituals, caffeine-aware choices and why relaxing drinks should not be marketed as anxiety treatments.
Read the guideThe six types of true tea: green, white, yellow, oolong, black and dark
A visual guide to the six processing families of Camellia sinensis tea, where they differ, why every family naturally contains caffeine, and what to brew.
Read the guide ↗Herbal teas explained: flowers, roots, leaves, grains and caffeine
Learn which herbal infusions are naturally caffeine-free, why botanical identity matters, how blends differ, and what health claims deserve scrutiny.
Read the guide ↗Hibiscus tea and blood pressure: what research actually suggests
Does hibiscus tea lower blood pressure? Explore limited human evidence, roselle traditions, caffeine, medication cautions and practical brewing.
Read the guide ↗Licorice root tea risks: blood pressure, potassium and medication interactions
Licorice root is naturally sweet but can carry serious risks. Learn why it may be unsuitable for high blood pressure, kidney conditions and pregnancy.
Read the guide ↗Valerian tea for sleep: traditional claims versus clinical evidence
Valerian has a long history as a sleep herb, but trial results are inconsistent. Understand its limitations, side effects and sedative-interaction cautions.
Read the guide ↗How much caffeine is in tea? Why the answer varies
Learn how green, black, matcha, oolong, decaf and herbal tea compare without misleading universal caffeine charts or false bedtime guarantees.
Read the guide ↗Green tea vs green tea extract: benefits and safety are not interchangeable
Understand why green tea research often studies extracts, what the beverage evidence suggests, and why concentrated green tea supplements pose additional risks.
Read the guide ↗Digestion & feeling comfortable
Choose a cup ↗Tea and digestion: what helps, what does not, and what to avoid
A practical digestion guide to ginger, peppermint tea, reflux and post-meal habits, separating clinical evidence from marketing claims.
Read the guideGinger tea for nausea: the difference between food and research
Ginger tea and nausea explained: where evidence exists, practical food-style brewing, side effects and when to seek care.
Read the guidePeppermint tea, bloating and heartburn: a careful guide
Learn what peppermint tea can and cannot be expected to do for digestion, how it differs from peppermint oil, and why reflux matters.
Read the guideCaffeine & your day
Choose a cup ↗Caffeine-free, decaf and low caffeine: what the labels mean
Understand naturally caffeine-free infusions, decaffeinated tea, low-caffeine claims and how to check for hidden caffeine.
Read the guideCaffeine, tea and sleep: when should the last cup be?
How tea caffeine may affect sleep, why sensitivity varies and how to choose an evening drink without misleading rules.
Read the guideEveryday health & habits
Choose a cup ↗Is green tea healthy? Benefits, limitations and caffeine
What green tea research suggests for health, why extract findings differ from a brewed cup and what caffeine-conscious readers should know.
Read the guideDoes tea count as water? Hydration without the myths
Do tea and herbal infusions count towards hydration? Clear everyday guidance on fluids, caffeine and sugary tea drinks.
Read the guideHealthy tea choices: why unsweetened often beats the hype
Build a healthier daily tea habit by understanding added sugar, ingredients and marketing claims rather than chasing detox trends.
Read the guideHow to brew herbal infusions safely and enjoyably
A friendly guide to making herbal infusions, ingredient labels, hot-water handling, steeping and safe serving.
Read the guideIngredient guides & safe choices
Choose a cup ↗Chamomile for sleep: tradition, evidence and safety
Is chamomile good for sleep? What clinical research actually says, how to make a simple cup and who should be cautious.
Read the guideRooibos: a naturally caffeine-free cup for any time
What rooibos is, why it fits caffeine-free routines, simple brewing ideas and the limits of wellness marketing around it.
Read the guideHerbal tea safety: medicines, allergies and hidden ingredients
A responsible herbal tea safety checklist covering allergies, drug interactions, pregnancy, concentrated extracts and ingredient labels.
Read the guideTea in pregnancy: caffeine limits and herbal cautions
Pregnancy tea questions explained: caffeine from green and black tea, herbal infusion precautions, and why individual medical advice matters.
Read the guideHow to read a tea label without falling for wellness jargon
A practical checklist for tea labels: actual ingredients, caffeine, sugar, origins, preparation and the difference between evidence and marketing.
Read the guideWhy trust a tea guide?
What is established, what is uncertain.
We link to public-health sources, state where studies concern capsules instead of tea, and avoid promising that drinks cure health conditions. The difference between evidence and tradition matters.
Read our editorial approach ↗