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Head-to-head evidence comparison — which supplement is right for you?
Epicatechin wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
10 of 17 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mixed evidence
4 of 12 studies with measurable effects showed benefit.
Top outcomes
100-200mg daily
With meals, Pre-workout or morning
Pure (-)-Epicatechin extract
150-300mcg for maintenance; higher only if deficient under supervision
Any time with food
Potassium iodide (most common and studied)
2-4 weeks
4 weeks
N/A
4-8 weeks
4-12 weeks
4-8 weeks
Dietary flavonoid for preventing colorectal neoplasms
The Cochrane database of systematic reviews (2012) · Meta analysis · n=390769
A statistically significant reduced risk of CRC was found with high intake of epicatechin.
Effects of chocolate, cocoa, and flavan-3-ols on cardiovascular health: a systematic review and meta-analysis of randomized trials
The American journal of clinical nutrition (2012) · Meta analysis · n=1297
Insulin resistance (HOMA-IR: -0.67; 95% CI: -0.98, -0.36) was improved by chocolate or cocoa due to significant reductions in serum insulin.
Impact of flavan-3-ols on blood pressure and endothelial function in diverse populations: a systematic review and meta-analysis of randomized controlled trials
European journal of preventive cardiology (2025) · Meta analysis · n=5205
Flavan-3-ol interventions included epicatechin, epigallocatechin-gallate, cocoa products, tea, grape extract, and apples delivering 586 mg (95% CI 510, 662) total flavan-3-ols.
Maternal Iodine Status and Birth Outcomes: A Systematic Literature Review and Meta-Analysis
Nutrients (2023) · Meta analysis · n=42269
Birth weight was similar between UIC ≥ 150 μg/L and <150 μg/L (difference = 30 g, 95% CI −22 to 83, p = 0.3, n = 13, I2 = 89%) with no evidence of linear trend (4 g per 50 μg/L, −3 to 10, p = 0.2, n = 12, I2 = 80%).
Iodine fortification of foods and condiments, other than salt, for preventing iodine deficiency disorders
The Cochrane database of systematic reviews (2019) · Meta analysis · n=4317
This is equivalent to an increase of 38.32 µg/L (95% CI 24.03 to 52.61 µg/L).
Systematic review and meta-analysis of iodine nutrition in modern vegan and vegetarian diets
The British journal of nutrition (2023) · Meta analysis · n=4421
Vegan diets had the poorest iodine intake (17·3 µg/d) and were strongly associated with lower iodine intake (P = < 0·001) compared with omnivorous diets.
Based on meta-analysis showing FMD improvements with flavan-3-ol interventions. Most studies used cocoa products rather than pure epicatechin. Conservative estimate given mixed study designs and populations.
Based on meta-analyses showing urinary iodine concentration increases with supplementation. Effects only meaningful in iodine-deficient populations. Excessive intake (>300mcg) may increase thyroid cancer risk. Most studies used potassium iodide; kelp-derived forms have variable bioavailability.
AI-estimated from published studies. Interpret as directional guidance.
Epicatechin has a higher evidence score (6.5/10 vs 8.5/10) and wins in 2 of 3 categories.
No known interactions between Epicatechin and Iodine have been documented in our database. However, always consult a healthcare provider before combining supplements.