Category Ingredients

HMB and Betaine

HMB and Betaine: Two Testosterone-Adjacent Ingredients Almost No Product We’ve Reviewed Actually Uses 2025 Meta-Analysis Reviewed 712 Participants Pooled Written by the Health Supplements Lab Editorial Team, drawing on a 2025 GRADE-assessed meta-analysis and controlled trials on betaine. Last reviewed…

CoQ10 and L-Carnitine

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…

Yohimbe

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…

Nitric Oxide

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…

NMN vs. NR

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…

Zinc 

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…

D-Aspartic Acid

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…

KSM-66 Ashwagandha

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…