Category: Ingredients

CoQ10 and L-Carnitine for Sperm Health: What the Evidence Actually Shows Head-to-Head Trial Reviewed Multiple Meta-Analyses Checked Written by the Health Supplements Lab Editorial Team. We read the head-to-head trial and several meta-analyses behind these two ingredients directly. Last reviewed September 2026 Unlike most ingredients we cover on this site, CoQ10 and L-carnitine have a…

Yohimbe: The Ingredient That Deserves More Caution Than Most Labels Suggest NIH Source Reviewed Real Adverse Event Data Written by the Health Supplements Lab Editorial Team. We drew on NIH/NCCIH’s public safety review and published poison control data to write this fairly and accurately. Last reviewed September 2026 Most ingredients we cover in this category…

Nitric Oxide and Erection Supplements: Why the Ingredient Form Matters More Than the Name Real Human ED Trial Examined 2 Products’ Doses Checked Written by the Health Supplements Lab Editorial Team. We checked which amino acid form and dose actual reviewed products use, against what the pharmacology research says works. Last reviewed September 2026 “Increases…

NMN vs. NR: Which NAD+ Booster Actually Has Better Evidence? 4 Human Trials Compared 3 Products Compared Written by the Health Supplements Lab Editorial Team. We read the underlying human trials behind all three NAD+ products we’ve reviewed to answer this fairly. Last reviewed September 2026 NMN and NR are the two most common ingredients…

Zinc and Testosterone: The Deficiency Connection Most Labels Don’t Mention Landmark Study Examined 5 Products’ Doses Compared Written by the Health Supplements Lab Editorial Team. We read the foundational zinc-testosterone research directly and checked how it applies to products we’ve reviewed. Last reviewed September 2026 Zinc appears in nearly every testosterone and male enhancement supplement…

D-Aspartic Acid and Testosterone: The Short-Term Result vs. the Longer-Term Reality 3 Studies Compared 2 Products’ Doses Checked Written by the Health Supplements Lab Editorial Team. We read all three key trials directly, not just the one most commonly cited in marketing. Last reviewed September 2026 D-Aspartic Acid (DAA) shows up in most testosterone supplements,…

KSM-66 Ashwagandha and Testosterone: What the Research Actually Shows 1 Peer-Reviewed Trial Examined 3 Products Compared by Dose Written by the Health Supplements Lab Editorial Team. We read the underlying clinical trial directly and compared it against the actual doses used in products we’ve reviewed. Last reviewed September 2026 If you’ve read more than one…