Top Pick
Thorne
Thorne Magnesium Bisglycinate
★★★★★$28–$38
The most bioavailable magnesium form — supports sleep, muscle function, and gut motility.
NSF Certified · Last verified 2026-05-18
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Constipation and Gut Motility During Weight Loss
Constipation affects roughly 25–30% of people on GLP-1 medications. It's uncomfortable and often underreported — but it's very manageable with the right approach.
Why It Happens
GLP-1 medications slow gastric emptying and reduce gut motility — the muscular contractions that move food through your digestive tract. Combined with reduced food intake (less bulk) and sometimes reduced fluid intake due to nausea, constipation is a predictable downstream effect.
Practical Strategies
- Increase soluble fiber gradually. Psyllium husk is one of the most evidence-backed options. Start low, go slow.
- Hydration is critical — fiber without adequate water makes constipation worse. Aim for 8+ cups daily.
- Move your body. Even a 20-minute walk after meals stimulates gut motility.
- Establish a consistent bathroom routine — try sitting after your morning coffee or meal when gut motility is naturally higher.
- Magnesium citrate (200–400mg at night) is widely used as a gentle osmotic laxative. Discuss with your provider.
- Avoid over-relying on stimulant laxatives (like senna) regularly — they can reduce natural gut function over time.
Products That May Help
Affiliate disclosure →These are specific products we recommend based on evidence and community feedback. Links are affiliate links — we may earn a commission at no extra cost to you.
Best Value
Doctor's Best
Doctor's Best High Absorption Magnesium Glycinate
★★★★★$15–$22
Same highly bioavailable form as Thorne at half the price.
Verification varies by brand · Last verified 2026-05-18
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Metamucil
Metamucil Psyllium Husk Fiber Capsules
★★★★★$22–$30
Capsule format for people who find the powder texture unpleasant — same reliable psyllium husk.
Verification varies by brand · Last verified 2026-05-18
→ Check Price on AmazonPremium Pick
Seed
Seed DS-01 Daily Synbiotic
★★★★★$50/month
A probiotic + prebiotic (synbiotic) with genuine clinical research behind specific strains.
Verification varies by brand · Last verified 2026-05-18
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Culturelle
Culturelle Digestive Daily Probiotic
★★★★★$20–$30
The most studied single-strain probiotic — Lactobacillus rhamnosus GG has more clinical evidence than almost any other probiotic strain.
Clinically studied ingredient · Last verified 2026-05-18
→ Check Price on AmazonQuestions to Ask Your Clinician
Bring these to your next appointment. Your prescriber is your best resource for decisions specific to your situation.
- “How many days without a bowel movement should prompt me to contact you?”
- “Is magnesium citrate appropriate for me given my other medications?”
- “Would a referral to a gastroenterologist be appropriate if this persists?”
- “Are there any medications I'm taking that could be worsening my constipation?”
Want to understand your medication?
Compare Ozempic, Wegovy, Mounjaro & Zepbound — active ingredients, approved uses, and trial data.
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