Daily Collagen Peptide Supplements Reduced Body Fat in Adults Over 50

Randomized, double-blind, placebo-controlled trial with 74 adults aged 50 and older. Participants were assigned to receive either 15 g/day of low-molecular collagen peptide or a placebo drink for 12 weeks while maintaining their normal physical activity levels. Body composition was measured using both bioelectrical impedance analysis (BIA) and dual-energy X-ray absorptiometry (DEXA). Physical activity, dietary intake, and blood biochemical markers were also monitored.

Age-related fat gain — especially around the trunk — is a major health concern for older adults, contributing to cardiovascular disease, diabetes, and mobility issues. If collagen peptide supplementation can meaningfully reduce body fat without requiring changes to diet or exercise, it would represent a simple, accessible intervention. This trial adds to growing evidence that collagen peptides may have metabolic effects beyond their well-known benefits for skin and joints.

Collagen peptides are primarily marketed for skin, joint, and bone health. This trial adds body composition to the list of potential benefits, which could significantly expand the appeal of collagen supplementation for aging populations. If replicated in larger studies, it suggests collagen peptides may have metabolic effects — possibly by influencing satiety signaling, muscle mass preservation, or fat metabolism — that go beyond structural protein support.

The sample size of 74 is relatively small. The 12-week duration doesn't reveal whether fat loss continues, plateaus, or reverses after stopping supplementation. The specific mechanism by which collagen peptides reduce body fat is not explained. BIA can be influenced by hydration status. Published in a smaller journal (Clinical Nutrition Research) rather than a high-impact journal. The collagen peptide product specifics (brand, amino acid profile) may affect reproducibility.