Magnesium carbonate
Magnesia alba
Forms: In antacids with aluminium hydroxide, in dialysis phosphate binders with calcium acetate, and as chalk for grip in climbing and the gym. Other magnesium salts have their own cards.
Other esters and forms: Magnesium, Magnesium aspartate, Magnesium chloride, Magnesium citrate, Magnesium gluconate, Magnesium glycinate (bisglycinate), Magnesium hydroxide, Magnesium L-threonate, Magnesium lactate, Magnesium malate, Magnesium orotate, Magnesium oxide, Magnesium sulfate (Epsom salt), Magnesium taurate
Inorganic magnesium salt used mainly as an antacid and, with calcium acetate, as a phosphate binder in dialysis. It is also the white chalk used for grip.
Legal status: Sold freely in antacids and supplements; phosphate binders containing it are prescription medicines; not prohibited in sport.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Taken for heartburn and acid indigestion and sometimes as a magnesium supplement; dialysis patients are prescribed it to lower blood phosphate. Athletes mostly meet it as grip chalk, which is used on the hands, not swallowed.
What people seek and what studies show
Antacids containing it relieve heartburn and acid indigestion. In dialysis patients a calcium acetate and magnesium carbonate binder controlled blood phosphate, but some patients developed raised blood magnesium. There are no good trials of carbonate as a sports supplement.
Effects
Evidence: Approved medicine — studied in people for its medical use
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
2 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 2 of 2 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. No measure removes a risk completely.
Limit caffeine, pre-workouts and other stimulants; with palpitations, stop the suspected drug, pause hard training and get an ECG. Don’t add potassium on your own (supplements, Asparkam/Panangin, salt substitutes): it is dangerous with spironolactone, ARBs/ACE inhibitors or kidney problems; a blood test shows the level.
How each option helps (1)
- Heart screening: ECG and echocardiogram — An ECG read by athlete criteria separates normal training changes from arrhythmias, conduction or QT problems — key with stimulants, clenbuterol, thyroid hormone or diuretics.
Low-level side effects
How each option helps (2)
- Working with a doctor — Assesses persistent vomiting or severe belly pain (possible pancreatitis or gallstones) and adjusts prescribed GLP-1 treatment when nausea persists.
- Pancreatin + dimeticone (Pankreoflat) — May ease heaviness and gas after meals; can cause nausea or diarrhea. Not for pork or cow's milk protein allergy (anaphylaxis reported) or early acute pancreatitis.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with a sports physician.
Which doctors can help
Get medical help at once if
- Racing or irregular heartbeat that does not settle at rest, dizziness, fainting (especially during exercise), chest pain — call your local emergency number.
In an emergency, call your local emergency number.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check