Supplement Ingredient Guides: PubMed-Cited Science Reviews 2026

🔬 Ingredient science

Ingredient Guides: Deep-Dive Science Reviews

Our ingredient guide series examines specific supplement compounds in depth — mechanism of action, human clinical trial evidence, effective dosing, safety profile, and quality considerations. Every guide cites primary research from PubMed-indexed journals. We cover both well-esta

Ingredient guides

Citations per article

PubMed

Primary source only

2026

Fully updated

The science behind this category

All reviews in this category

Every article cites peer-reviewed primary sources. Last updated July 2026.

Article 01

Berberine: Is “Nature’s Ozempic” Real? What the Science Actually Says Read review →

Article 02

NMN Supplement Review 2026: Does the Anti-Aging Science Hold Up?Read review →

Article 03

Ashwagandha Benefits and Side Effects: What 20+ Clinical Trials Show Read review →

Article 04

Lion’s Mane Mushroom: Benefits, Evidence, and Best Supplements 2026 Read review →

Article 05

Saffron Supplement Review 2026: The Evidence for Mood, Anxiety, and Sleep Read review →

Article 06

Rhodiola Rosea Review 2026: The Stress Adaptogen Backed by Real Science Read review →

Article 07

Collagen Supplements: What the Science Shows About Skin, Joints, and Muscle Read review →

Article 08

Colostrum Supplement Review 2026: Leaky Gut and Immunity Evidence Read review →

Article 09

Peptide Supplements 2026: What’s Legal, What’s Evidence-Based, and What’s Hype Read review →

Article 10

Methylene Blue for Cognitive Enhancement: What the Science Shows Read review →

Article 11

Moringa: Is the “Miracle Tree” Actually Miraculous?Read review →

Article 12

Supplement Stacking Guide 2026: How to Combine Supplements Safely Read review →

Article 13

Does Creatine Actually Work? What 500+ Studies Say Read review →

Article 14

Best Supplements for Men Over 40: What the Evidence Supports Read review →

Frequently asked questions

How do you evaluate ingredient evidence?

We use a hierarchy of evidence: systematic reviews and meta-analyses of RCTs carry the most weight, followed by individual RCTs, then observational studies. Mechanistic evidence (in vitro and animal studies) is noted but does not constitute evidence of effectiveness in humans. We clearly label when evidence is from animal models or in vitro only.

What sources do you cite?

All citations are from PubMed-indexed journals: JISSN, American Journal of Clinical Nutrition, British Journal of Sports Medicine, Nutrients, NEJM, The Lancet, Cochrane Database, and equivalent peer-reviewed sources. We do not cite supplement brand websites, blogs, or secondary aggregators as evidence for health claims.

How often are ingredient guides updated?

We review and update our ingredient guides when significant new research is published. All guides display a last-updated date. If you notice a major study that contradicts our current position, email [email protected] — we take citation accuracy seriously.

Start with our top-rated review

Start with our berberine guide — the most-searched supplement ingredient of 2026, with the most nuanced analysis of the “nature’s Ozempic” claim available anywhere online.

Read the berberine guide →