Collagen Research

This systematic review and meta-analysis assessed the clinical efficacy of collagen-based supplements on knee osteoarthritis symptoms. Searches conducted until October 2023 across MEDLINE, EMBASE, Web of Science, and Scopus identified RCTs evaluating oral collagen supplements for knee OA.

This systematic review and meta-analysis of 23 RCTs (1,474 participants) examined collagen supplements for skin aging. Overall, collagen appeared to improve skin hydration, elasticity, and wrinkles. However, critically, subgroup analysis by funding source revealed that only industry-funded studies showed benefits, while independent studies showed no effect. Similarly, high-quality studies showed no significant effects while low-quality studies did.

This systematic review and meta-analysis assessed the anti-aging effects of oral collagen supplementation on skin. The authors included 26 randomized controlled trials encompassing over 1,700 participants, making it one of the larger meta-analyses on this topic.

Results showed that oral collagen supplementation significantly improved skin hydration and elasticity compared to placebo. Subgroup analysis revealed that hydrolyzed collagen peptides at doses between 5 and 10 g per day, taken for more than 8 weeks, produced the most consistent improvements. Both fish-derived and bovine-derived collagen showed positive effects on skin parameters.

The meta-analysis also examined skin wrinkle outcomes and found favorable trends, though with greater variability across studies. The authors noted that the quality of evidence was moderate overall, with some risk of bias from industry funding in several included trials. They concluded that oral collagen supplementation is a viable strategy for improving age-related skin changes, particularly hydration and elasticity.

This systematic review and meta-analysis investigated the effects of oral hydrolyzed collagen supplementation on skin rejuvenation outcomes. The authors conducted a comprehensive search across PubMed, Cochrane Library, and other databases, ultimately including 17 randomized controlled trials.

The pooled results demonstrated statistically significant improvements in skin moisture, elasticity, and wrinkle depth following hydrolyzed collagen supplementation. The analysis highlighted that low-molecular-weight collagen peptides (under 5 kDa) showed superior absorption and bioavailability, translating to greater skin benefits. Supplementation durations of at least 8 weeks were associated with more pronounced effects.

The authors also explored the mechanistic basis for these findings, noting that collagen peptides appear to stimulate fibroblast activity and promote endogenous collagen synthesis in the dermis. While the overall quality of included studies was deemed acceptable, the review flagged variability in dosing protocols and collagen sources as limitations. The authors concluded that hydrolyzed collagen is a safe and effective oral supplement for skin rejuvenation, with low-molecular-weight formulations offering the best results.

This systematic review and meta-analysis evaluated the effects of oral hydrolyzed collagen supplementation on skin aging parameters. The authors searched multiple databases and included 19 randomized controlled trials with a total of 1,125 participants aged 20 to 70.

The pooled analysis found that hydrolyzed collagen supplementation significantly improved skin hydration, elasticity, and wrinkles compared to placebo. Subgroup analyses showed benefits across different collagen doses (ranging from 1 to 10 g/day) and supplementation durations (4 to 24 weeks). The collagen peptides used were primarily derived from fish and porcine sources.

While heterogeneity across studies was moderate to high for some outcomes, the overall direction of effect was consistent. The authors concluded that hydrolyzed collagen supplementation appears to be a promising approach for improving skin aging markers, though they noted that more standardized trials with longer follow-up periods would strengthen the evidence base.

This randomized, double-blind, placebo-controlled trial examined whether collagen peptide supplementation enhances the effects of resistance training in elderly men with sarcopenia. 53 men (average age 72) completed a 12-week guided resistance training program while receiving either 15g collagen peptides or placebo daily.

The collagen group showed significantly greater improvements in fat-free mass, muscle strength, and fat loss compared to placebo. This suggests collagen peptides may provide additional benefits beyond regular protein for older adults doing resistance training.

This double-blind, placebo-controlled trial tested whether specific bioactive collagen peptides (VERISOL) could reduce wrinkles and stimulate skin matrix production. 114 women aged 45-65 received either 2.5g collagen peptides or placebo daily for 8 weeks.

The collagen group showed significant reductions in eye wrinkle volume and increased production of key skin matrix proteins. Benefits persisted 4 weeks after stopping supplementation, suggesting lasting effects on skin structure.

This was the first long-term clinical trial examining collagen supplementation for activity-related joint pain in athletes. 147 Penn State varsity and club athletes with joint pain but no joint disease were randomized to receive 10g collagen hydrolysate or placebo daily for 24 weeks.

The collagen group showed significant improvements in joint pain during various activities. The effect was most pronounced in athletes with knee pain, suggesting collagen may help maintain joint health in high-impact athletes.