Medical disclaimer: GutVerdict summarizes what people say about supplements on Reddit. It is not medical advice, and nothing here is meant to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration. Talk to your doctor or pharmacist before starting a supplement, especially if you are pregnant, take medicines, or have a medical condition. New, severe or worsening symptoms (such as blood in the stool, weight loss, fever, or night-time symptoms) need a doctor, not a supplement. Full disclaimer.

Magnesium citrate vs Magnesium oxide

On Reddit, owners rate Magnesium citrate higher overall (4.0 vs 4.0). Scores summarize self-reported experiences and are not evidence that either will work for you.

Magnesium citrateMagnesium oxide
Typecapsules, tablets or powdertablets or capsules
GutVerdict score4.04.0
Owner sentiment3.43.9
Recommendations4.53.0
Tolerability4.84.7
Owner comments843279
Rated comments329113
Unwanted effects reported6%9%
Top praiseDose & timing, RegularityDose & timing, Regularity
Top complaintsSide effects, Dose & timingDose & timing, Side effects

By symptom

ContextMagnesium citrateMagnesium oxide
IBS-C & constipation153 of 234 positive67 of 78 positive
IBS-D & loose stools13 of 24 positive5 of 6 positive
Bloating & gas28 of 43 positive15 of 15 positive
SIBO76 of 95 positive31 of 36 positive
After antibiotics8 of 11 positive3 of 3 positive
Stool form4 of 6 positiveToo few comments
Pain & cramping31 of 51 positive11 of 15 positive

What owners say about Magnesium citrate

2/5

“Taking more and more laxatives, drinking Magnesium Citrate as a last resort, NEVER AGAIN.”

owner comment via r/IBS · 2026-10-13 · 34 upvotes
4/5

“Today I would take some magnesium citrate, because wherever is fermenting in your gut needs to be released not stuck up inside of you.”

owner comment via r/Microbiome · 2026-04-10 · 20 upvotes
4/5

“I want to recommend the magnesium citrate gummies by Nature Vitality brand.”

owner comment via r/Constipation · 2025-11-12 · 19 upvotes

Full Magnesium citrate page →

What owners say about Magnesium oxide

4/5

“Now at 32 I have not had an attack like this in almost a year whilst taking 400mg of magnesium oxide every night before bed..”

owner comment via r/IBS · 2026-08-23 · 10 upvotes
4/5

“The Micromag looks like all magnesium oxide (I may be mistaken), to give the higher percentage of magnesium inside each molecule, but this is a grey area for me because I don't know what that would do in the body.”

owner comment via r/Supplements · 2026-09-01 · 2 upvotes
4/5

“Magnesium oxide at bedtime helped me tremendously.”

owner comment via r/Constipation · 2025-11-17 · 7 upvotes

Full Magnesium oxide page →

Talk to a doctor or pharmacist before switching or combining supplements, particularly if you take other medicines.