Fiber & Gut Health
Constipation affects up to 50% of GLP-1 users, driven by slower gastric emptying and reduced food volume. Psyllium husk has the strongest clinical evidence for constipation relief of any fiber supplement. These products also support the gut bacteria that naturally produce GLP-1, creating a beneficial feedback loop.
How we chose these products
Every product in this category is assigned an evidence tier — Strong, Moderate, or Emerging— based on the clinical research behind the key ingredient category. Products labeled “GLP-1 Specifically Labeled” are formulated or marketed directly for GLP-1 medication users.
Our composite score weights evidence tier, Amazon rating, and review volume. Products are sorted by composite score by default. We earn affiliate commissions on purchases, which does not influence our ratings.
What to look for
Psyllium husk (Metamucil, etc.) has the strongest clinical evidence for constipation relief of any fiber supplement — it's backed by multiple randomized controlled trials. It also lowers cholesterol and supports gut bacteria that produce endogenous GLP-1.
Magnesium-based products (magnesium citrate, magnesium oxide) work differently from fiber: they draw water into the intestine osmotically. They're more reliable for acute constipation relief but shouldn't replace dietary fiber long-term.
Probiotic products have weaker evidence for constipation specifically, but emerging research shows certain strains (particularly Akkermansia muciniphila) may support the gut bacteria that enhance GLP-1 activity. This is a genuinely interesting area of research.
Top picks — 29 products
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Frequently asked questions
Why does Ozempic cause constipation?
Ozempic (semaglutide) and other GLP-1 medications slow gastric emptying as part of their mechanism of action — this is intentional and helps with satiety. The side effect is that food moves through your digestive system more slowly, which can cause constipation. Reduced food volume also means less bulk to stimulate bowel movements.
What's the best fiber supplement for Ozempic constipation?
Psyllium husk has the strongest clinical evidence of any fiber supplement for constipation relief. It forms a gel in your intestine that softens stool and stimulates bowel movements. Take it with plenty of water — without adequate hydration, psyllium can make constipation worse.
How long does constipation last on GLP-1 medications?
Constipation is typically most pronounced in the first few weeks of each dose increase and often improves as your body adjusts. For many users, it's manageable with adequate fiber, hydration, and light exercise. Persistent severe constipation warrants discussion with your prescribing provider.
Can I take MiraLax with Ozempic or Mounjaro?
Polyethylene glycol (MiraLax) is generally safe to use alongside GLP-1 medications for occasional constipation relief. However, it's not a long-term solution — fiber supplementation and adequate hydration are better for ongoing management. Always consult your healthcare provider for persistent constipation.