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.
Ariana is right—it’s a macronutrient issue, not a collagen-specific issue. Pure collagen peptides contain absolutely zero dietary fiber.
From a formulation strategy standpoint, this presents a great opportunity. To combat this potential side effect, I often suggest my clients formulate a “Gut Health Collagen Blend.” We take a high-quality hydrolyzed peptide base and blend it with soluble fibers (like inulin or acacia fiber) and some probiotics. It completely eliminates the constipation issue and allows the brand to charge a premium for a multi-functional product.
We monitor customer feedback very closely, and while it’s relatively rare, we do occasionally get complaints about constipation.
Usually, it happens when a customer who normally has a low-protein diet suddenly starts taking 20g of pure collagen every day. Any sudden increase in protein intake without a corresponding increase in water consumption can slow down digestion. We train our customer service team to advise users to increase their hydration and start with a smaller dosage before working their way up to a full scoop.