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Head-to-head evidence comparison — which supplement is right for you?
Iodine and Propolis are closely matched across evidence, studies, and safety.
Verdict
Mixed evidence
4 of 12 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
10 of 10 studies with measurable effects showed benefit.
Top outcomes
150-300mcg for maintenance; higher only if deficient under supervision
Any time with food
Potassium iodide (most common and studied)
300-1000mg daily (standardized extract)
With food, Divided doses for higher amounts, Throat spray can be used as needed
Standardized extract (capsules or tincture)
4-12 weeks
4-8 weeks
1-2 weeks
2-4 weeks
1-2 weeks
Acute
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.
Dosage exploration of the effects of honey and its derivatives on cardiometabolic outcomes: an overview of systematic reviews and GRADE-assessed updated meta-analysis
Nutrition & diabetes (2025) · Meta analysis · n=3544
Propolis demonstrated reductions in anthropometric measures and improvements in lipid profile, glycemic control, liver enzymes, and inflammation and oxidative stress markers.
The impact of propolis supplementation on inflammatory biomarkers: A meta-analysis and systematic review of randomized controlled clinical trials
Prostaglandins & other lipid mediators (2024) · Meta analysis · n=1139
The propolis supplementation significantly reduced IL-6 (WMD = -2.48; 95 % CI: -4.62, -0.34; P = 0.023) and TNF-α (WMD = -0.86; 95 % CI: -1.45, -0.26; P = 0.005) compared with control groups.
Potential Effects of Bioactive Compounds of Plant-Based Foods and Medicinal Plants in Chronic Kidney Disease and Dialysis: A Systematic Review
Nutrients (2024) · Systematic review
Systematic review examining Propolis efficacy
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.
Based on meta-analyses showing significant reductions in IL-6, TNF-α, and CRP. Effect sizes were modest with WMD of -2.48 for IL-6 and -0.86 for TNF-α. Conservative effectiveness reflects variable study quality and heterogeneity between trials.
AI-estimated from published studies. Interpret as directional guidance.
Both Iodine and Propolis are closely matched — the best choice depends on your specific health goals.
No known interactions between Iodine and Propolis have been documented in our database. However, always consult a healthcare provider before combining supplements.