FreeStyle Libre 3
The Libre 3 is the smallest, thinnest CGM on the market (the size of two stacked pennies), offering the highest clinical accuracy (7.9% MARD) available in a consumer-ready device. It provides minute-by-minute readings directly to a smartphone without the need for manual scanning.
Ingredients & Purity
Utilizes a proprietary wired-enzyme technology. The sensor filament is extremely thin and flexible, reducing the inflammatory response at the insertion site compared to older, thicker filaments.
Scientific Evidence
Clinical trials demonstrated an overall MARD of 7.9%, which is currently the lowest (most accurate) in the industry for a continuous monitor.
Brand Transparency
Abbott is transparent about clinical data but their primary app is designed for medical use; data portability to longevity apps (like Apple Health) can sometimes be more restricted compared to Dexcom.
Value Assessment
If purchased with a prescription but without insurance, it often retails for $75-$150 for a 28-day supply (two 14-day sensors), making it highly competitive for those who can obtain a script.
Why Not Alternatives?
It is significantly smaller than the Dexcom G7 and generally has a lower out-of-pocket cost at pharmacies. While the app is less 'longevity-focused' than third-party platforms, the hardware's accuracy beats almost all competitors.