TL;DR – Quick Summary
- 20g of daily collagen peptides raised a key bone-formation marker by 5.1% in female runners.
- Inflammation marker IL-6 dropped significantly in the collagen group vs. placebo.
- Collagen is a complement to good nutrition, not a replacement for adequate energy intake.
A new study on female runners shows daily collagen peptides improved bone formation markers and reduced inflammation — without replacing good nutri...
Source: MindBodyGreen →
If you take collagen and have ever wondered whether it is actually doing something, a study published in May 2026 offers some concrete evidence — at least for bone health in active women.
What Did the Study Find?
Researchers tracked 22 pre-menopausal women who run at least 35 miles per week. For four weeks, half took 20 grams of collagen peptides daily while the other half took a placebo. The results, reported by MindBodyGreen, showed a 5.1% increase in P1NP — a key marker of bone formation — in the collagen group, while the placebo group saw a slight decline. At the same time, IL-6, a marker of inflammation, dropped significantly in the collagen group but not in the placebo group.
The bone-resorption marker sRANKL also decreased in the collagen group while it rose in the placebo group, which is another encouraging signal for long-term bone integrity.
Is This Relevant If You Don’t Run Marathons?
Not everyone logging 35 miles a week, but the findings speak to something broader. Women — particularly as they move through their thirties and forties — face increasing pressure on bone density. High physical activity without proper recovery nutrition is one risk factor, but lower-impact lifestyle factors like chronic stress, undereating, or nutrient gaps can chip away at bone health too.
Collagen peptides are one of the more well-tolerated supplements on the market, and this study adds to a growing body of evidence for their role in bone support. The researchers were careful to note that collagen is “not a substitute for adequate energy intake” — meaning it works best as part of a nourishing diet, not as a shortcut.
What This Means for Our Readers
If you are already taking collagen for skin or joint support, this study gives you one more reason to stick with it. If you are new to it, 20 grams daily is the dose used in this trial. Look for hydrolyzed collagen peptides, which are the form most studied for absorption. Pairing it with vitamin C (see our foods-for-skin article) can support collagen synthesis further. As always, check with your healthcare provider before adding new supplements, especially at therapeutic doses.
Source: MindBodyGreen, May 18, 2026
