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HEART FUNCTION

Green Tea

Camellia sinensis

also known as tea, green tea extract

Strong
Green Tea — Köhler 1887 botanical illustration

The same plant that gives the world black tea, oolong, and white tea — but minimally processed to preserve its catechins, the antioxidant family that drives most of the modern research. One of the most-studied beverages on earth, with consistent evidence for cardiovascular and metabolic support.

  • Modestly lowers LDL cholesterol with regular daily intake
  • May modestly lower blood pressure over time
  • Supports healthy blood sugar and insulin sensitivity
  • Modest support for fat metabolism — best evidence comes from the catechin EGCG combined with caffeine
  • Powerful antioxidant action from catechins, particularly EGCG
  • Long traditional use for mental clarity — the combination of caffeine and L-theanine is gentler than coffee
  • Lower caffeine than coffee, with the calming amino acid L-theanine that softens the stimulation
Concentrated green tea extracts have caused liver injury, including some serious cases — drinking the tea is far safer than taking high-dose extract supplements
Use caution with blood thinners — green tea can interact with warfarin
Reduces the absorption of iron and certain medications — separate doses by at least an hour
Caffeine content can disrupt sleep, raise blood pressure, and worsen anxiety in sensitive people
Use caution with stimulant medications — additive effects
Limit during pregnancy due to caffeine — moderate tea consumption is generally considered safe, but extracts are not

NCCIH — Green Tea · MedlinePlus Herbs & Supplements · NIH NCCIH Herbs at a Glance

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The curious few.
50 founding spots left

Know what you're putting in your body.

158 herbs, nutrients, and compounds. What the science says, what tradition knew, and what to watch for. Founding members keep this running.

$60 /year

Founding rate — locked for life. Regular price after launch: $96/year.

  • ✓ Full access to all 158+ entries
  • ✓ Print-ready reference card for every herb
  • ✓ Monthly curated set — 5 herbs, one body system
  • ✓ The Sunday Letter — weekly research digest
  • ✓ Bookmarks synced across devices
  • ✓ Founding rate locked forever
Become a founding member

Cancel any time. No questions asked.