Comparison
5 evidence-based guides on comparison — backed by clinical research and scored in our catalog.
How to Compare Multivitamins: 4 Dimensions That Actually Matter
Form, dose, what's left out, and third-party testing. How to compare multivitamins like an analyst instead of a shopper — plus why most mega-dose multis are wasted money.
Alpha-GPC vs Citicoline: Which Choline Source Actually Works?
Two of the most effective nootropics, both precursors to acetylcholine. We break down the evidence, dosing, bioavailability, and which one fits which goal.
Vitamin D3 vs D2: The Science Behind the 87% Gap
D3 raises blood levels 87% more effectively than D2 — and your prescription vitamin D might be the inferior form. Here's what to know.
Berberine vs Metformin: The Evidence Behind 'Nature's Metformin'
Berberine is marketed as natural metformin, but the comparison is more nuanced. Here's how the mechanisms, evidence, and safety profiles actually stack up.
Methylcobalamin vs Cyanocobalamin: Which B12 Form Actually Works
Most B12 supplements use cyanocobalamin — but methylcobalamin is the bioactive form. Here's when the difference matters and when it doesn't.