Yes, some dark-coloured discharge is perfectly normal when taking Daye's ProViotics. In most cases it’s nothing to worry about, it’s just the residue from the ProViotic.
We use freeze-drying and cold compression for the bacteria, meaning the discharge does not contain anything but the bacteria and vaginal discharge. It will also wash out of your underwear no problem.
Vaginal discharge also changes throughout each phase of the menstrual cycle.
Read more about how to spot healthy vs. unhealthy discharge, here.
That being said, we would always recommend monitoring any changes. If your discharge begins to smell or cause any kind of irritation, we would recommend reaching out so we can give you some more specific advice.