Evidence-backed FAQ
Does collagen help bone density?
Direct answer
A 12-month randomized trial in postmenopausal women and a later meta-analysis suggest collagen peptides may improve bone mineral density, but the evidence remains limited and heterogeneous.[1], [2]
What the evidence shows
The trial studied about 5 g/day of specific collagen peptides in postmenopausal women with reduced bone mineral density. Some pooled trials combined collagen with calcium and vitamin D.[1], [2]
Important limitations
Much of the evidence comes from one population and specific products. Calcium and vitamin D co-interventions make collagen's independent contribution harder to isolate.[1], [2]
Related questions
- Who was studied in the key trial?
- Was collagen always studied by itself?
Read the full evidence summary
This FAQ is the concise answer. The linked research page provides the full study context, populations, doses, outcomes, and limitations.
References
- Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study.. Nutrients. 2018. Randomized controlled trial View source →
- Efficacy of collagen peptide supplementation on bone and muscle health: a meta-analysis.. Frontiers in nutrition. 2025. Systematic review View source →