EGCG dosage

Protocol

1. 1

   Measure the dose

   Typical EGCG dose is 400 mg (300 to 600 mg/day, taken with food; doses above 600 mg/day add side-effect burden and approach EFSA hepatotoxicity threshold). Use a weight-based calculator for individual adjustments.

   Open tool →
2. 2

   Set the frequency

   Administer 1 to 2 times daily with food. Half-life of 3 hours anchors the dosing interval.

   Open tool →
3. 3

   Cycle if needed

   Not strictly required at low doses; some users pulse 8 weeks on / 4 weeks off as a precautionary measure for high-dose extracts

   Open tool →
4. 4

   Monitor for side effects

   Watch for: nausea; abdominal discomfort; diarrhea; jitteriness (with caffeine). Stop or reduce dose if tolerability breaks down.

Why this dose

Inhibits catechol-O-methyltransferase (COMT) to prolong norepinephrine signaling; activates AMPK; scavenges reactive oxygen species via gallate ester; modulates gut microbiome and pancreatic lipase activity.

The typical dose (400 mg) reflects 300 to 600 mg/day, taken with food; doses above 600 mg/day add side-effect burden and approach EFSA hepatotoxicity threshold. Individual response varies with body weight, baseline status, concurrent training, and concurrent medications, so the labeled range is the starting point rather than the prescription.

How to administer

EGCG is administered via the oral route. Oral dosing is straightforward: take with water, with or without food unless specifically noted.

Onset of action runs around 1.5 hours after administration. Peak effect lands near 2 hours post-dose. Plan the administration window so that peak effect lines up with whatever outcome you are dosing for, whether that is training, sleep, or symptom coverage.

Half-life note: Plasma half-life ~2 to 4 hours; oral bioavailability 0.1 to 1.0% with substantial inter-individual variation

Cycling and tolerance

Not strictly required at low doses; some users pulse 8 weeks on / 4 weeks off as a precautionary measure for high-dose extracts

Effects to expect at typical dose

• Modest fat loss (~1.3 kg over 12 weeks) when combined with caffeine and caloric deficit
• Small reductions in LDL cholesterol (3-6 mg/dL) and systolic blood pressure (2-3 mmHg)
• EFSA flags hepatotoxicity risk above 800 mg/day, particularly when taken fasted
• Bioavailability is 0.1-1.0%; gut microbiome variation drives population-variable response
• Green tea extract typically combines EGCG with caffeine and L-theanine for additive effects
• Reduces non-heme iron absorption when co-administered with meals

Side effects and interactions

Common side effects

• nausea
• abdominal discomfort
• diarrhea
• jitteriness (with caffeine)
• sleep disruption (with caffeine)

Notable interactions

• iron supplements (moderate): reduces non-heme iron absorption; separate by 2 to 3 hours
• beta-blockers (nadolol) (moderate): reduced absorption when taken simultaneously
• hepatotoxic supplements (high-dose niacin, kava) (moderate): theoretical additive hepatotoxicity at high EGCG doses
• anticoagulants (minor): additive effects at high catechin doses
• stimulants and caffeine (minor): additive thermogenic and cardiovascular effects

Lists above cover commonly reported and well-characterized items. They are not exhaustive: review the full EGCG profile and discuss with a clinician familiar with your medication list before starting, particularly if you are on prescription therapy or have a chronic condition.

Regulatory snapshot

WADA status

allowed

DEA / Rx

Not scheduled

Pregnancy

Avoid high-dose extracts; moderate green tea consumption appears acceptable

Legal status

Dietary supplement; warning labels required above 800 mg/day in some EU jurisdictions

Do not use if

• pregnancy at high-dose extracts
• active liver disease
• iron deficiency anemia (separate dosing)

Related research