Each page opens with the verdict, then a real comparison table — evidence grade, best human trial, studied dose, price, who it suits, who should skip it — then the honest “it depends”, then the citations. Where neither option is well supported, the page says neither.
For the narrow job of raising blood NAD⁺ they look interchangeable — a 2026 randomized trial testing both head to head found NMN and NR raised circulating NAD⁺ comparably. Neither has shown a proven health…
Different jobs. Urolithin A has the better randomized evidence for aging muscle — endurance and strength gains in short trials, nearly all manufacturer-funded. Ubiquinol's real signal is cardiac: Q-SYMBIO and…
Neither is a proven senolytic in people. Quercetin has the better human data — meta-analyses show a 2–3 mmHg blood-pressure reduction, mostly in people who already have hypertension — but its senolytic fame…
Creatine, unless you cannot train. It is the only compound in this pair graded Strong: meta-analyses of resistance-training trials show roughly +1.4 kg lean tissue mass and real strength gains in older…
Neither, on current human evidence. Spermidine's most rigorous trial — twelve months at the 0.9 mg/day dose supplements actually use — missed its primary memory endpoint. Fisetin's headline mouse lifespan…
Glycinate, for almost everyone. Magnesium's blood-pressure and sleep evidence is a mineral effect, and glycinate delivers real elemental magnesium at a lower price. L-threonate is a cognition bet built on…
Different people. Berberine has the larger glucose effect — meta-analyses show HbA1c down roughly 0.6–0.9% — but the trial base is small, short and mostly single-region, and it inhibits CYP3A4 and CYP2D6, so…
Test first if you eat fish, supplement first if you don't. The Omega-3 Index is the better-validated of the two: a pooled analysis of 17 prospective cohorts links higher blood omega-3 to lower mortality,…
Ask your clinician for the panel first — it is the cheaper, standardised measurement, and non-HDL cholesterol from it already captures most of what ApoB adds. Order ApoB when the two are likely to disagree:…
If you don't have diabetes, probably neither. The 25-trial meta-analysis of CGM as a behaviour-change tool found the benefit driven almost entirely by participants who had diabetes, and commercial insulin…
Home cuff for almost everyone. Both measure out-of-office pressure, which predicts outcomes better than a clinic reading — but home monitoring is what the treatment trials paired with clinician-guided…
Oura, if the number is what matters. Against an ECG reference across 536 nights the Gen 4 gave nocturnal resting heart rate within about 2% and HRV within about 6% — the best of five wearables tested. WHOOP…
Buy the cheaper one. These measure the same thing, and the inexpensive digital dynamometer has been tested head to head against the Jamar — the reference instrument — with correlations of 0.97 to 0.99.…
Diclofenac gel for joints, lidocaine for a small patch of nerve pain. Topical diclofenac is the best-evidenced over-the-counter pain topical on this site — Cochrane found about 60% of participants had much…
Both are second-choice. Capsaicin has the better osteoarthritis data — a moderate effect over four weeks — but roughly one extra user in three gets a burning sensation and a 2024 meta-analysis rates the…
Retinaldehyde if your skin tolerates it, bakuchiol if it doesn't. The one good head-to-head trial compared bakuchiol with retinol — not retinaldehyde — and found them comparable over 12 weeks with less…
Retinaldehyde, if you are choosing one. In an eight-week trial a retinaldehyde cream matched a course of glycolic-acid peels on crow's-feet depth, and in a direct comparison of photodamaged skin, tretinoin…
Curcumin has the deeper evidence base for joint symptoms — a meta-analysis of eleven meta-analyses found reduced pain and stiffness — but the high-bioavailability formulations that make it work are the ones…
Nothing on a comparison page is written from memory. The evidence grade comes from the same grading map that runs the store, so a grade can never say one thing on a product page and another here. Doses come from the recorded studied ranges. Prices are the catalog's typical listed prices. Every quote is taken verbatim from the cited paper, and null and negative trials are included on purpose — a comparison that only quotes the flattering studies is marketing with footnotes.
Where a comparison involves something Magellan does not sell — nicotinamide riboside, a standard lipid panel — we say so on the page. Those are the comparisons worth the most, because there is nothing to gain from the answer.