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Is Magnesium Hydroxide safe in food and drink?

Medicines & supplements1 use researched3 sourced claims

Where it turns up: common antacid and laxative active. Detox My Life researched magnesium hydroxide under one use, because the same substance means something different in each use. Every claim below carries its evidence tier, how sure the research is that it applies here, and the sources it cites. The level is computed by the app's own deterministic engine, so the page says exactly what the app would.

Level by use and lens

UseMainstreamCautious (default)BasedConcerns · favour · fringe
Eaten or drunkSwapSwapSwap3 · 0

Mainstream shows consensus claims only; Cautious adds emerging research; Based adds fringe claims, labelled as such. The last column counts, under Cautious, the sourced concerns, the findings in its favour and the fringe claims Based would add.

Safer swaps: the app's swap catalog has no entry tied to this ingredient yet. When you scan a product that contains it, the app suggests cleaner alternative types for that product; the swap categories list what the catalog covers today.

Eaten or drunk Swap

Under the default Cautious lens magnesium hydroxide in food and drink rates Swap: the app would put this near the top of your swap plan. Mainstream (consensus only) rates it Swap; Based (adds the fringe) rates it Swap. Researched 2026-09-03.

Sourced concerns (3)

ConsensusMetabolicconfidence 100%

Ingestion of excessive amounts of magnesium hydroxide can lead to hypermagnesemia (high magnesium levels in the blood), especially in individuals with impaired kidney function or infants, which can cause confusion, drowsiness, muscle weakness, irregular heartbeat, and difficulty breathing.

Why here
Magnesium hydroxide dissociates in stomach acid to magnesium ions, which are absorbed in the small intestine. When intake exceeds the body's ability to excrete it, particularly with compromised kidney function, magnesium accumulates in the blood.
What would have to be true
Oral intake of magnesium hydroxide, particularly in high doses (e.g., 224–917 mg/kg-d in infants) or prolonged use, or in individuals with kidney disease.
Sources the engine cites (no regulator, review or study among them):
  • 5 web articles (elchemy.com, clevelandclinic.org, rxlist.com, …), linked in the app.
ConsensusIrritant · allergenconfidence 100%

Ingestion of magnesium hydroxide commonly causes gastrointestinal side effects such as diarrhea, abdominal cramping, nausea, and bloating, particularly with higher doses or prolonged use.

Why here
Magnesium hydroxide acts as a saline laxative by drawing water into the intestines, which softens stool and increases bowel movements, leading to these effects.
What would have to be true
Oral intake of magnesium hydroxide, especially in doses used for laxative effects or prolonged use.
Sources the engine cites (no regulator, review or study among them):
  • 7 web articles (elchemy.com, clevelandclinic.org, rxlist.com, …), linked in the app.
ConsensusMetabolicconfidence 100%

Severe diarrhea resulting from magnesium hydroxide ingestion can lead to dehydration and electrolyte imbalances, including paradoxical hypomagnesemia in some cases of excessive loss.

Why here
The laxative action of magnesium hydroxide can cause significant fluid and electrolyte loss through increased bowel movements.
What would have to be true
Oral intake of magnesium hydroxide leading to severe or prolonged diarrhea.
Sources the engine cites:

Not researched here

The engine has no dossier for magnesium hydroxide when cooked with heat, in cold food, as a finishing ingredient, in heated food packaging or other uses. The app researches an ingredient for the use it infers from your product, so a scan fills these in; this page only shows what has already been researched and source-verified.

This is research, not medical advice. Detox My Life shows sourced claims sorted by evidence tier. It does not diagnose, treat, or tell you to start or stop anything. Talk to a qualified professional about your health.

Scan your own. The app reads any product label with your camera, works out how you are about to use it, and researches every ingredient for that use with live sources. Every scan adds to a Detox Score for your home, where 50 is a typical home in your region, and a plan of next swaps.

See also: all ingredients · paste a label to check it · how to read an ingredient flag