Loading…
We use essential cookies (authentication, your saved goals/stack) by default. With your permission we’ll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Head-to-head evidence comparison — which supplement is right for you?
Iodine vs Nicotinamide Riboside: Iodine has the stronger overall evidence (8.5 vs 5.5/10); they're alternatives for boost daily energy — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Iodine wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Limited support
1 of 4 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
Top outcomes
150-300mcg for maintenance; higher only if deficient under supervision
Any time with food
Potassium iodide (most common and studied)
1000 mg daily (the dose used in most outcome trials; lower doses raise blood NAD+ but have not been tested for clinical effects)
Morning with breakfast, Split dosing (morning and midday) for doses above 500 mg
Nicotinamide Riboside Chloride capsules or powder
and 2 more not shown
and 1 more not shown
4-12 weeks
4-8 weeks
1–2 weeks
4–8 weeks
8–16 weeks
4–8 weeks
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.
NAD⁺ supplementation for anti-aging and wellness: A PRISMA-guided systematic review of preclinical and clinical evidence.
Ageing Research Reviews (2026) · Systematic review
Reviewed 113 intervention studies published from 2010 to October 2025: 33 in humans (28 of them randomised) and 80 in rodents, covering NR, NMN and injected NAD+.
The Effect of Nicotinamide Mononucleotide and Riboside on Skeletal Muscle Mass and Function: A Systematic Review and Meta-Analysis.
Journal of Cachexia, Sarcopenia and Muscle (2025) · Meta analysis
Systematic review and meta-analysis of placebo-controlled RCTs of NMN or NR in adults with a mean age of 60.9 to 83 years, looking at muscle mass, grip strength, gait speed and other physical performance tests.
Effects of NAD+ precursor supplementation on glucose and lipid metabolism in humans: a meta-analysis.
Nutrition & Metabolism (2022) · Meta analysis · n=14750
Meta-analysis of 40 clinical studies (14,750 participants) of four NAD+ precursors: nicotinamide riboside, nicotinamide mononucleotide, nicotinic acid (niacin) and nicotinamide.
The points come from one 8-week RCT in overweight adults, where 100, 300 and 1,000 mg a day raised whole-blood NAD+ by 22%, 51% and 142%, with no difference in adverse events versus placebo or between doses (PMID 31278280). Other trials at 1 g a day found similar rises, 2.6-fold in older adults with mild cognitive impairment (PMID 37994989). No trial compared doses above 1,000 mg, so no optimal dose is plotted. The ceiling is the 2,000 mg a day that a 12-week RCT in obese men found safe (PMID 29992272). The NR-SAFE trial also found 3,000 mg a day well tolerated over 4 weeks in 10 people with Parkinson's disease (PMID 38016950).
AI-estimated from published studies. Interpret as directional guidance.
Iodine has a higher evidence score (8.5/10 vs 5.5/10) and wins in 2 of 3 categories.
For boost daily energy, Iodine has a higher relevance score (95 vs 78).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
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.
NAD+ boosters raise a biomarker — but the anti-aging benefits aren’t proven in humans. The honest read.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.