do collagen peptides break a fast？

This is exactly how we approach our marketing. We get this question daily.
We explicitly position our hydrolyzed collagen as a “keto-friendly, fast-extending” supplement. Because a standard 10g serving is only about 35-40 calories with zero carbs, we tell our customers that mixing it into black coffee won’t spike their blood sugar. It keeps them satiated longer without ruining the metabolic benefits of their intermittent fasting routine. It’s all about setting the right expectations on the label.