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Head-to-head evidence comparison — which supplement is right for you?
Iodine vs Testosterone (TRT): Iodine has the stronger overall evidence (8.5 vs 5.6/10); they're alternatives for testosterone & cortisol balance — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Iodine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mixed evidence
4 of 11 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)
Prescription-only and clinician-directed — this is a controlled substance, NOT a self-administered supplement, and we do not provide a non-medical dosing protocol. For context only: TRT for diagnosed hypogonadism is titrated to a mid-normal testosterone level. Intramuscular testosterone esters (cypionate/enanthate) are commonly dosed around 50–100 mg weekly (or ~100–200 mg every 2 weeks); long-acting testosterone undecanoate is dosed less frequently. Transdermal gels (~50–100 mg/day applied) and subcutaneous injection are alternative routes. Supraphysiologic anabolic-steroid doses are far higher, illegal, and dangerous — not a regimen this library endorses.
any
Clinician-prescribed testosterone (intramuscular ester or transdermal gel) for diagnosed hypogonadism — controlled substance, prescription-only
4-12 weeks
4-8 weeks
Weeks to months
Months
Months
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.
Effects of Testosterone Treatment in Older Men.
The New England journal of medicine (2016) · Rct · n=790
The coordinated Testosterone Trials (TTrials) — seven randomized, double-blind, placebo-controlled trials in 790 men aged 65+ with confirmed low testosterone and symptoms, treated with testosterone gel for one year
Cardiovascular Safety of Testosterone-Replacement Therapy.
The New England journal of medicine (2023) · Rct · n=5246
TRAVERSE: a randomized, double-blind, placebo-controlled non-inferiority trial of transdermal testosterone in 5246 middle-aged and older hypogonadal men with high cardiovascular risk — the largest TRT cardiovascular-safety trial
Safety and Efficacy of Testosterone Therapy on Musculoskeletal Health and Clinical Outcomes in Men: A Systematic Review and Meta-Analysis of Randomized Placebo-Controlled Trials.
Endocrine practice (2023) · Meta analysis
Systematic review and meta-analysis of 16 randomized placebo-controlled trials (1728 men, mean age 77) of testosterone therapy on musculoskeletal outcomes
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 3 of 3 categories.
For testosterone & cortisol balance, Iodine has a higher relevance score (85 vs 60).
No known interactions between Iodine and Testosterone (TRT) have been documented in our database. However, always consult a healthcare provider before combining supplements.
Selenium helps; iodine can WORSEN Hashimoto’s. The honest take on "thyroid support".
What’s safe while nursing, the truth about milk-supply herbs, and what to avoid (it passes into milk).
Commonly recommended vs ask-your-clinician vs avoid — a general, safety-first overview.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.