can collagen peptides cause constipation?

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.