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Head-to-head evidence comparison — which supplement is right for you?
Iodine wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mixed evidence
4 of 12 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
150-300mcg for maintenance; higher only if deficient under supervision
Any time with food
Potassium iodide (most common and studied)
~500-1000mg pomegranate extract (standardized to ellagic acid/punicalagins) or ~250-500ml juice daily
with-meals
Standardized extract
4-12 weeks
4-8 weeks
4-12 weeks
4-12 weeks
Throughout use
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.
Does pomegranate consumption improve oxidative stress? A systematic review and meta-analysis of randomized controlled clinical trials.
Clinical nutrition ESPEN (2022) · Meta analysis
Improved antioxidant/oxidative-stress markers
Lipid profile changes after pomegranate consumption: A systematic review and meta-analysis of randomized controlled trials.
Phytomedicine : international journal of phytotherapy and phytopharmacology (2016) · Meta analysis
No significant effect on cholesterol/triglycerides
Effect of food sources of nitrate, polyphenols, L-arginine and L-citrulline on endurance exercise performance: a systematic review and meta-analysis of randomised controlled trials.
Journal of the International Society of Sports Nutrition (2021) · Meta analysis
Pomegranate among polyphenol sources affecting vascular function
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.
Iodine has a higher evidence score (8.5/10 vs 5.6/10) and wins in 2 of 3 categories.
No known interactions between Iodine and Pomegranate have been documented in our database. However, always consult a healthcare provider before combining supplements.