by Benefiber · Convenient but fermentable soluble fiber

Dissolves invisibly with no grit, but readily fermented — more likely to add gas to an uncomfortable gut. Contains wheat (gluten).
Wheat dextrin dissolves invisibly into liquids with no grit or taste, which is its whole selling point. The catch for GLP-1 users: it is readily fermented, so it is one of the more likely powders to add gas and bloating to a gut that is already uncomfortable. Fine for someone who tolerates it, but not a first pick when minimizing bloating is the goal. Contains wheat (gluten), not suitable for celiac disease.
GLP-1 medications slow how fast the gut moves, and you're taking in less of everything, fiber and water included. That combination is why constipation is one of the most common early side effects. The catch: the wrong fiber can make things worse. Highly fermentable types feed gas production in a gut that is already bloated and uncomfortable.
Start at about half the label dose and build up over a week or two, and treat water as non-negotiable, because fiber works by holding water in the stool and taking it dry can backfire. Non-fermenting fibers tend to be the most comfortable starting point. If constipation doesn't ease with fiber, fluids, and magnesium over a couple of weeks, that is worth a call to your prescriber.
Citrucel (methylcellulose)#1 · Non-fermenting bulk-forming fiber
Metamucil / Konsyl (psyllium husk)#2 · Premium gel-forming soluble fiber
Sunfiber (partially hydrolyzed guar gum, PHGG)#3 · Low-gas soluble fiber
Ground flaxseed (whole-food fiber)#4 · Whole-food soluble + insoluble fiber
FiberCon (calcium polycarbophil)#5 · Non-fermenting bulk-forming caplet
Acacia fiber (gum arabic)#6 · Gentle slow-fermenting soluble fiberPrices change often; tap through for the current cost. We may earn a commission, which never changes our picks.
This is general information, not medical advice. Talk to your prescriber before adding a supplement, especially if you have kidney disease, heart disease, or take prescription medication.