This profile is for informational purposes only and is not medical advice. Consult a healthcare professional before use. See full terms.
EGCG (Epigallocatechin Gallate)
The most potent catechin in green tea with powerful neuroprotective, anti-inflammatory, and antioxidant properties - supports working memory, attention, and protection against age-related cognitive decline.
Benefits
What is EGCG (Epigallocatechin Gallate)?
Epigallocatechin gallate (EGCG) is the most abundant and biologically active catechin polyphenol in green tea (Camellia sinensis), accounting for 50-80% of green tea's total catechin content. A single cup of green tea contains approximately 50-100 mg of EGCG, and it is the compound most responsible for the widely studied cognitive and health benefits of green tea consumption.
EGCG crosses the blood-brain barrier and exerts neuroprotective effects through multiple mechanisms. A 2014 randomised controlled trial published in Psychopharmacology by Scholey et al. demonstrated that a single dose of EGCG-rich green tea extract significantly increased alpha-wave activity in the brain (associated with calm focus) and improved performance on working memory tasks compared to placebo. A 2017 meta-analysis in Phytomedicine covering 21 studies found that green tea and EGCG consumption was associated with reduced risk of cognitive impairment and dementia. EGCG inhibits amyloid-beta and alpha-synuclein aggregation (the toxic protein clumps in Alzheimer's and Parkinson's), chelates redox-active iron and copper, activates the Nrf2 antioxidant pathway, and promotes BDNF expression. A 2012 study in Molecular Nutrition and Food Research showed that EGCG enhanced adult hippocampal neurogenesis and spatial memory in mice. Its combination of acute cognitive enhancement and long-term neuroprotection makes it one of the most versatile natural nootropics available.
- Anti-amyloid activity: Directly binds to amyloid-beta peptides and alpha-synuclein, preventing their aggregation into neurotoxic oligomers and fibrils
- Nrf2 activation: Activates the Nrf2 antioxidant response element, upregulating endogenous antioxidant enzymes including glutathione, SOD, and catalase
- BDNF enhancement: Increases brain-derived neurotrophic factor expression in the hippocampus, supporting neuroplasticity and neurogenesis
- Metal chelation: Chelates redox-active iron (Fe3+) and copper (Cu2+) ions that catalyse Fenton reactions generating hydroxyl radicals in the brain
- COMT inhibition: Inhibits catechol-O-methyltransferase, slowing the breakdown of catecholamines (dopamine, norepinephrine) and maintaining their synaptic levels
- Alpha-wave promotion: Increases alpha-wave activity in the brain, associated with a state of relaxed alertness and improved attentional performance
- Supplement dosage: 200-400 mg of EGCG per day from standardised green tea extract
- Green tea equivalent: 3-5 cups of green tea daily provides approximately 150-350 mg of EGCG
- Timing: Take on an empty stomach for maximum absorption, or with a light meal. Avoid taking with iron-rich meals as EGCG inhibits non-haem iron absorption
- Vitamin C pairing: Taking EGCG with vitamin C (50-100 mg) stabilises the catechin and improves its absorption
- Onset: Acute cognitive effects (alpha-wave increase) within 1-2 hours. Neuroprotective benefits develop over weeks to months
- Generally safe from tea: Green tea has thousands of years of safe consumption. Moderate intake (3-5 cups/day) is well established as safe
- Liver caution at high doses: Concentrated EGCG supplements above 800 mg/day have been associated with rare cases of liver injury. Stay below 400 mg/day from supplements and monitor liver function with high-dose use
- Iron absorption: EGCG significantly inhibits non-haem iron absorption. Individuals with iron deficiency should separate EGCG from iron-rich meals by 2+ hours
- Caffeine content: Green tea extract supplements may contain residual caffeine. Decaffeinated extracts are available for caffeine-sensitive individuals
- Drug interactions: May interact with blood thinners (warfarin), beta-blockers (nadolol), and some chemotherapy agents. Consult your doctor if taking medications
Natural Sources & Forms
- Standardised green tea extract: Capsules standardised to 50-98% EGCG content, widely available from supplement retailers
- Matcha: Shade-grown green tea powder containing high EGCG concentrations (approximately 3x regular green tea per gram)
- Green tea: Loose-leaf or bagged green tea. Brewing at 70-80C for 2-3 minutes maximises catechin extraction
- Decaffeinated green tea extract: Available for those wanting EGCG benefits without caffeine
Frequently Asked Questions
The most potent catechin in green tea with powerful neuroprotective, anti-inflammatory, and antioxidant properties - supports working memory, attention, and protection against age-related cognitive decline.
The key benefits of EGCG (Epigallocatechin Gallate) include: Anxiety & Calm, Cognitive Enhancement, Focus, Longevity, Memory, Mood.
Anti-amyloid activity: Directly binds to amyloid-beta peptides and alpha-synuclein, preventing their aggregation into neurotoxic oligomers and fibrils Nrf2 activation: Activates the Nrf2 antioxidant response element, upregulating endogenous antioxidant enzymes including glutathione, SOD, and catalase BDNF enhancement: Increases brain-derived neurotrophic factor expression in the hippocampus, supporting neuroplasticity and neurogenesis Metal chelation: Chelates redox-active iron (Fe3+) and copper (Cu2+) ions that catalyse Fenton reactions generating hydroxyl radicals in the brain COMT inhibition: Inhibits catechol-O-methyltransferase, slowing the breakdown of catecholamines (dopamine, norepinephrine) and maintaining their synaptic levels Alpha-wave promotion: Increases alpha-wave activity in the brain, associated with a state of relaxed alertness and improved attentional performance
Supplement dosage: 200-400 mg of EGCG per day from standardised green tea extract Green tea equivalent: 3-5 cups of green tea daily provides approximately 150-350 mg of EGCG Timing: Take on an empty stomach for maximum absorption, or with a light meal. Avoid taking with iron-rich meals as EGCG inhibits non-haem iron absorption Vitamin C pairing: Taking EGCG with vitamin C (50-100 mg) stabilises the catechin and improves its absorption Onset: Acute cognitive effects (alpha-wave increase) within 1-2 hours. Neuroprotective benefits develop over weeks to months
Generally safe from tea: Green tea has thousands of years of safe consumption. Moderate intake (3-5 cups/day) is well established as safe Liver caution at high doses: Concentrated EGCG supplements above 800 mg/day have been associated with rare cases of liver injury. Stay below 400 mg/day from supplements and monitor liver function with high-dose use Iron absorption: EGCG significantly inhibits non-haem iron absorption. Individuals with iron deficiency should separate EGCG from iron-rich meals by 2+ hours Caffeine content: Green tea extract supplements may contain residual caffeine. Decaffeinated extracts are available for caffeine-sensitive individuals Drug interactions: May interact with blood thinners (warfarin), beta-blockers (nadolol), and some chemotherapy agents. Consult your doctor if taking medications
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