can collagen peptides cause constipation?

Biologically, collagen peptides are actually known to support gut health. The amino acids glycine and glutamine help strengthen the lining of the intestinal tract.
However, protein requires a lot of water to metabolize. If consumers take dry collagen powder in a tiny shot of espresso and don’t drink water the rest of the day, their gastrointestinal motility will slow down. It’s simply a matter of the body pulling water from the colon to process the heavy protein load.