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Calcium and magnesium and IBS...

Heather Van Vorous, Author · Heather's IBS Newsletter - Help for Irritable Bowel Syndrome

Oct 4, 2026 · 1 min listen · Last updated October 4, 2026

Calcium and magnesium influence how the smooth muscles of your gastrointestinal tract contract and relax. They play important but opposite roles in regulating gut motility. 1. Calcium: Promotes Muscle Contraction Mechanism: Calcium ions enter smooth muscle cells through calcium channels, triggering muscle contraction in the gut wall.

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Calcium and magnesium influence how the smooth muscles of your gastrointestinal tract contract and relax.

They play important but opposite roles in regulating gut motility.

1. Calcium: Promotes Muscle Contraction

**Mechanism:**Calcium ions enter smooth muscle cells through calcium channels, triggering muscle contraction in the gut wall.**Effect on Motility:**Higher calcium levels can

increase muscle toneand contractility, which mayslow down intestinal movement.With IBS, calcium might help diarrhea but worsen constipation.

2. Magnesium: Promotes Muscle Relaxation

Mechanism:Magnesium acts as a natural calcium channel blocker. Itcompetes with calcium, reducing muscle contraction and promoting relaxation.**Effect on Motility:**Adequate magnesium levels can help maintain

smooth, coordinated bowel movements.With IBS, magnesium might help constipation but worsen diarrhea.

In a nutshell:

Calcium→ muscle contraction → slows motilityMagnesium→ muscle relaxation & water retention in the gut → speeds motility

And more about how vitamins and minerals affect IBS…

You are not alone.

P.S. If you need help or have questions hit the Green Button below and I’ll try to answer every one of you!

If you need immediate help please join my Private IBS Coaching.

XOXO

Heather

Heather Van Vorous

40+ years of IBS advocacy

Get full help for IBS here

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