Magnesium is an essential mineral your body uses in hundreds of processes — supporting nerve signaling, muscle contraction and relaxation, heart rhythm, blood pressure control, energy production (ATP), and the building of DNA and proteins. It also helps keep bones and teeth strong by working alongside calcium and vitamin D. Most adults need roughly 400–420 mg/day (men) and 310–320 mg/day (women), with needs changing during pregnancy and breastfeeding. Yet many people fall short, often because modern diets lean heavily on processed foods or because certain medications and health conditions interfere with absorption or increase loss. When magnesium runs low, your body may feel it in subtle ways long before a blood test flags it.

Deficiency can show up as muscle cramps or twitching, fatigue, poor sleep, irritability, headaches/migraines, tingling or numbness, low appetite or nausea, and even heart rhythm changes. Risk rises with heavy alcohol use, diabetes, digestive disorders (like Crohn’s or celiac), kidney issues, older age, heavy menstrual bleeding, and sometimes high intake of caffeine or sugar. Low magnesium has also been linked to long-term health problems such as high blood pressure, cardiovascular disease, osteoporosis, asthma, metabolic syndrome, type 2 diabetes, migraines, and mood disorders — not as a “single cause,” but as a factor that can worsen the body’s balance. Food-first sources include leafy greens, beans and lentils, nuts and seeds, whole grains, and dark chocolate. If supplements are needed, many people tolerate magnesium glycinate/bisglycinate well, while other forms may cause stomach upset. If symptoms are persistent or you have medical conditions, it’s best to confirm with a clinician before supplementing.