Magnesium: Essential benefits and risks of excessive intake

Magnesium is a vital mineral involved in hundreds of biochemical processes, including muscle function, energy production, protein synthesis, blood pressure regulation, and blood sugar maintenance. It plays a critical role in the nervous system by acting as a natural calcium blocker to prevent nerve cell overstimulation, and it is essential for bone health, with approximately 60% of the body's magnesium stored in bone tissue.

While most people can obtain sufficient magnesium through a balanced diet, supplementation is common. However, excessive intake, particularly from supplements, can lead to hypermagnesemia. Symptoms of mild magnesium toxicity include nausea, diarrhea, and abdominal cramps, while severe cases can result in breathing difficulties, heart rhythm disturbances, and cardiac arrest.

Daily requirements vary by age, sex, and life stage. For adults, recommended daily intakes from food and supplements combined typically range between 310 mg and 420 mg depending on gender. For supplements specifically, the upper limit for adults is generally cited at 350 mg per day. Deficiency often manifests as chronic fatigue, muscle cramps, and lethargy.