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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.

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

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.

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.

Many of the uses for protein powder also apply to collagen, with a few key considerations. For starters, collagen powder is not quite as versatile as other types of protein powder.

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%.

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.