High doses of magnesium from supplements or medications can cause nausea, abdominal cramping and diarrhea.
Magnesium is not well-absorbed orally, and much of it passes through the colon, causing diarrhea. The more magnesium you take, the more diarrhea you are likely to have, so the first step is cutting back on the magnesium. That should reduce or resolve the diarrhea if the magnesium is causing it.
However, high doses of magnesium from dietary supplements or medications often result in diarrhea that can be accompanied by nausea and abdominal cramping [1]. Forms of magnesium most commonly reported to cause diarrhea include magnesium carbonate, chloride, gluconate, and oxide [12].
Early signs of excessive magnesium intake can include low blood pressure, facial flushing, depression, urine retention, and fatigue. Eventually, if untreated, these symptoms can worsen and include muscle weakness, difficulty breathing, irregular heartbeat, and even, in very rare cases, cardiac arrest.
Magnesium glycinate -- Magnesium glycinate (magnesium bound with glycine, a non-essential amino acid) is one of the most bioavailable and absorbable forms of magnesium, and also the least likely to induce diarrhea. It is the safest option for correcting a long-term deficiency.
Magnesium oxide is an osmotic laxative, and its key effect is a softening of hard stools; therefore, it is important to first ask the patient about the hardness of stools and the frequency of bowel movement.
Nassar says that taking a magnesium supplement every day likely isn't unsafe for most people. Just be sure you're not taking too much magnesium. The maximum dietary allowance for most adults is around 400 mg or less.
High doses of magnesium from supplements or medications can cause nausea, abdominal cramping and diarrhea. In addition, the magnesium in supplements can interact with some types of antibiotics and other medicines.
Magnesium for sleep
Some studies have found that magnesium supplements can: Make it easier to fall asleep. Improve sleep quality. Reduce symptoms of restless legs syndrome, which can interfere with a good night's sleep.
Stool softener: Magnesium draws water into the intestines, working as an osmotic laxative. This increase in water stimulates bowel motion, or motility. It also softens and increases the size of the stool. This prompts a bowel movement and helps to make stools easier to pass.
Magnesium helps to increase the amount of water in the intestines, which can help with bowel movements. It may be used as a laxative due to these properties, or as a supplement for magnesium deficiency.
Taking large doses of vitamin C can cause diarrhea. Other supplements which can cause diarrhea when taken in high doses include ashwagandha, NAC (N-acetyl-cysteine), lysine, iodine and kelp supplements which contain iodine, D-limonene, and yacon syrup.
The ideal forms of magnesium to use in order to avoid diarrhea are those that are best absorbed by the body, such as magnesium chloride, bisglycinate, and glycerophosphate. These tend to have less of a laxative effect, although any magnesium can cause loose stools, or worse, if taken in high enough doses.
People with diabetes, intestinal disease, heart disease or kidney disease should not take magnesium before speaking with their health care provider. Overdose. Signs of a magnesium overdose can include nausea, diarrhea, low blood pressure, muscle weakness, and fatigue. At very high doses, magnesium can be fatal.
When taken in very large amounts (greater than 350 mg daily), magnesium is POSSIBLY UNSAFE. Large doses might cause too much magnesium to build up in the body, causing serious side effects including an irregular heartbeat, low blood pressure, confusion, slowed breathing, coma, and death.
Magnesium is important for maintaining muscle and nervous system function, cardiac electrical properties, and for supporting immune system as well as regulating glucose and insulin metabolism [2,3].
For individuals who need to take magnesium supplements, there is some encouraging news. Contrary to popular belief, these supplements do not cause weight gain.
Although many people use magnesium for sleep support, it isn't known to cause tiredness during the day. However, if you want to maximize the benefits for better sleep, it's best to take your magnesium supplement an hour or two before bedtime.
Magnesium citrate can help treat constipation. It is an osmotic laxative, which means it works by drawing water into the intestine to soften stool and make it easier to pass.
Some individuals see better bowel movements with 200-500 mg of Magnesium gluconate, oxide or citrate in the morning and evening. The dose for magnesium is individual, so begin low and increase the dosage as needed.
Magnesium citrate is a great option for people with constipation, as it can have a gentle laxative effect. This supplement works by pulling water into the intestines to make your bowel movements softer and easier to pass. However, unlike magnesium oxide, the laxative effect is much more tolerable.