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Mineral

Magnesium Citrate

Magnesium citrate is a magnesium salt of citric acid. It is a common form of magnesium in supplements and, in larger amounts, is used as a laxative.

Essential HealthStress & MoodBone & JointSleepCardiovascular

What it is studied for

The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.

ConstipationStrongA3 studies
Essential HealthModerateA3 studies
StressStress & MoodModerateBNo linked study
Bone densityBone & JointSmallBNo linked study
Sleep qualitySleepSmallBNo linked study
Blood pressureCardiovascularSmallBNo linked study
All 8 rated effectsGrouped by health goal, with the publications behind each rating

Why does the same name appear on two kinds of product?

Magnesium citrate supplies magnesium, an essential mineral, and is also used in medicines for occasional constipation. In its laxative use, it helps retain water in stool, making bowel movements easier. The product and purpose matter as much as the ingredient name. 1 2

What does magnesium do in the body?

Magnesium participates in energy production, muscle and nerve function and bone structure. Those everyday roles explain why getting enough matters. They do not, by themselves, show that extra magnesium citrate improves energy or performance when intake is already adequate. 1

Magnesium status is also harder to assess than a single number suggests. Most magnesium is in cells and bone, and serum magnesium does not closely reflect all body stores. NIH describes assessment as a combination of laboratory findings and clinical context. 1

Key studies

The most recent publications linked to Magnesium Citrate's ratings.

Effect of Magnesium Supplementation on Inflammatory Parameters: A Meta-Analysis of Randomized Controlled Trials2022Association of dietary magnesium intake with chronic constipation among US adults: Evidence from the National Health and Nutrition Examination Survey2021Magnesium Oxide in Constipation2021Senna Versus Magnesium Oxide for the Treatment of Chronic Constipation: A Randomized, Placebo-Controlled Trial.2020The Role and the Effect of Magnesium in Mental Disorders: A Systematic Review2020
All 6 studiesEvery publication linked to Magnesium Citrate

Why people take it

Essential Health21%
Energy12.5%
Bone & Joint11.7%
Immune Support9.9%
Sleep7.6%
Stress & Mood6.8%

SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.

Questions people ask

Is magnesium citrate the same as elemental magnesium?

No. Citrate identifies the compound; elemental magnesium is the amount of magnesium itself. The Supplement Facts panel gives the elemental amount. 1

How quickly does magnesium citrate work for constipation?

MedlinePlus gives a usual range of 30 minutes to six hours for its laxative use. That timing describes the medicine, not a general benefit from a daily nutritional supplement. 2

Is citrate better absorbed than oxide?

In a 60-day trial in healthy adults, citrate performed better on absorption-related measures. The trial did not compare sleep, muscle recovery or other clinical benefits. 3

Does citrate improve sleep?

The citrate trial in a 2021 review did not show a clear overall sleep-quality advantage over placebo. The often-quoted pooled reduction in time to fall asleep came from oxide trials. 4

Why does the German supplement limit fall below the daily requirement?

The DGE reference describes total intake, including food. The BfR supplement recommendation addresses extra magnesium and diarrhea risk; naturally occurring food magnesium is excluded from that upper-level framework. 5 6

Can people with kidney disease use it freely?

Kidney impairment increases the risk of magnesium toxicity. MedlinePlus identifies kidney disease as a reason for medical discussion before using magnesium citrate. 1 2

Sources

  1. Magnesium: Fact Sheet for Health Professionals NIH Office of Dietary Supplements