Comparison
Berberine vs EGCG
Side-by-side of Berberine and EGCG. Every row below is pulled from the compound schema and will update as our data grows. For deeper reads, follow through to each compound page.
Berberine
Berberine supplement guide: 1500 mg/day lowers fasting glucose and HbA1c, AMPK activation, metformin parity in RCTs, dihydroberberine absorption.
EGCG
EGCG supplement guide: 300-600 mg/day green tea catechin for fat loss and cardiovascular markers. Hepatotoxicity risk above 800 mg/day fasted.
Effects at a glance
Berberine
- •Lowers HbA1c by ~0.7% versus placebo at 1500 mg/day across 27-trial meta-analysis (Lan 2015)
- •Roughly comparable to metformin on fasting glucose and HbA1c in small head-to-head RCTs (Yin 2008)
- •Reduces LDL cholesterol 10-20% and triglycerides 15-25% via PCSK9 inhibition
- •Activates AMPK, the cellular energy sensor that drives insulin-independent glucose uptake
- •Oral bioavailability under 1%; dihydroberberine is the higher-absorption alternative at lower doses
- •GI side effects affect 10-30% at 1500 mg/day; split dosing with meals reduces incidence
EGCG
- •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-by-side
| Attribute | Berberine | EGCG |
|---|---|---|
| Category | natural | natural |
| Also known as | berberine HCl, berberine hydrochloride | epigallocatechin gallate, green tea extract |
| Half-life (hr) ↗ | 3 | 3 |
| Typical dose (mg) ↗ | 1500 | 400 |
| Dosing frequency | 3x daily with meals | 1 to 2 times daily with food |
| Routes | oral | oral |
| Onset (hr) | 2 | 1.5 |
| Peak (hr) | 3 | 2 |
| Molecular weight | 336.36 | 458.37 |
| Molecular formula | C20H18NO4+ | C22H18O11 |
| Mechanism | Activates AMP-activated protein kinase (AMPK), suppressing hepatic gluconeogenesis and lipogenesis while increasing peripheral glucose uptake. Inhibits PCSK9 transcription, modulates bile acid signaling, and shifts gut microbiome composition. | 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. |
| Legal status | Dietary supplement (US, EU, UK, Canada); Rx in some Asian jurisdictions | Dietary supplement; warning labels required above 800 mg/day in some EU jurisdictions |
| WADA status | allowed | allowed |
| DEA / Rx | Not scheduled | Not scheduled |
| Pregnancy | Contraindicated (kernicterus risk in neonates) | Avoid high-dose extracts; moderate green tea consumption appears acceptable |
| CAS | 2086-83-1 | 989-51-5 |
| PubChem CID | 2353 | 65064 |
| Wikidata | Q411435 | Q307091 |
Safety profile
Berberine
Common side effects
- constipation
- diarrhea
- abdominal cramping
- flatulence
- nausea
Contraindications
- pregnancy
- lactation
- neonatal jaundice
- severe liver disease
Interactions
- metformin: additive HbA1c reduction; additive GI side effects(moderate)
- insulin or sulfonylureas: additive hypoglycemia risk; dose adjustment may be required(major)
- statins (simvastatin, atorvastatin): CYP3A4 inhibition raises statin plasma levels(moderate)
- cyclosporine: raises cyclosporine levels through CYP3A4 and P-gp inhibition(major)
- calcium channel blockers (amlodipine): elevated plasma levels via CYP3A4 inhibition(moderate)
EGCG
Common side effects
- nausea
- abdominal discomfort
- diarrhea
- jitteriness (with caffeine)
- sleep disruption (with caffeine)
Contraindications
- pregnancy at high-dose extracts
- active liver disease
- iron deficiency anemia (separate dosing)
Interactions
- iron supplements: reduces non-heme iron absorption; separate by 2 to 3 hours(moderate)
- anticoagulants: additive effects at high catechin doses(minor)
- beta-blockers (nadolol): reduced absorption when taken simultaneously(moderate)
- hepatotoxic supplements (high-dose niacin, kava): theoretical additive hepatotoxicity at high EGCG doses(moderate)
- stimulants and caffeine: additive thermogenic and cardiovascular effects(minor)
Which Should You Take?
Berberine and EGCG score evenly on the criteria we weight (goal breadth, legal accessibility, evidence depth). The conditionals below should drive the decision more than any aggregate score.
- → If your priority is metabolic health and glucose control, pick Berberine.
- → If your priority is healthspan extension, pick Berberine.
- → If your priority is cardiovascular health, pick Berberine.
Edge case: Berberine is contraindicated in pregnancy; EGCG is the safer pick if that applies.
Default choice: either is defensible. Berberine edges out on goal breadth + legal accessibility; EGCG is the right call if your priority sits in the goals listed above.
This verdict is generated from each compound's schema (goals, legal status, evidence outcomes, dosing route). It updates automatically as our compound data evolves; the deeper read sits on each individual compound page.
Common questions
What is the difference between Berberine and EGCG?
Berberine and EGCG differ in category (natural vs natural), mechanism, and typical dosing. See the side-by-side table for full details.
Which has a longer half-life, Berberine or EGCG?
Berberine half-life is 3 hours; EGCG half-life is 3 hours.
Can you stack Berberine with EGCG?
Stack compatibility depends on mechanism overlap, legal status, and individual response. Check each compound page for specific interactions and contraindications before combining.
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