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Participants who consumed the collagen-rich bars experienced impressive results. They lost twice as much weight—approximately 6.6 pounds compared to the control group’s 3.3 pounds.

The collagen-enriched protein bars are already on the market. The researchers are now running a larger trial to learn more about mechanisms of action, particularly in relation to the gut microbiota.

Collagen-based protein bars may help with weight loss, study finds. Written by Erika Watts on May 17, 2025 — Fact checked by Amanda Ward.

Research being presented at this year's European Congress on Obesity (ECO 2025) and published in the journal Nutrients indicates that collagen could be a safe and effective weight-loss supplement.

While 81% of the bars had sufficient protein quantities to be labeled as “high in protein,” protein digestibility could be low, ranging from 86% to as low as 47%.

Managing diabetes requires close attention to what you eat, especially regarding snacking. Protein bars can be a convenient, nutritious choice—if you know what to look for.  In this guide, we’ll ...