Taking a multivitamin or separate fiber supplement alongside this formula is common — worth understanding what to actually check before combining the two.
Compare both labels for any overlapping fiber sources, since some general wellness or digestive-support blends may already include inulin or resistant starch alongside this formula's own 211mg and 100mg doses.
Since this formula's own materials describe a short adjustment period with mild gas as normal in week one, doubling up on fiber sources from multiple products could intensify that adjustment period — worth checking total fiber intake across everything you take.