Bloating on a New Prebiotic Supplement: What's Normal, Week by Week

Gas, bloating, or looser stools in the first week of a fibre-and-probiotic supplement are common — the fibre working, not a bad reaction. Here's what's typical and when to actually be concerned.

Extra fermentable fibre arriving in a gut that isn't used to it produces gas, mild bloating, or looser stools in a lot of people. This usually settles within seven to ten days as bacterial populations adjust.

The most commonly reported real change, with the most plausible mechanism. Transit becomes more predictable and post-meal heaviness may ease as fermentation processes stabilize.

Severe or persistent symptoms beyond the initial adjustment window are not typical and warrant stopping use and seeking medical advice — this isn't an expected part of the process at that point.