Most people don’t think about magnesium, but it helps with over 300 chemical reactions in your body — from muscle function to sleep and blood sugar control. If you feel tired, get muscle cramps, or can’t sleep, low magnesium might be part of the problem. This page breaks down what magnesium does, how to spot a shortage, which supplement forms work best, and how to take it safely.
Magnesium helps relax muscles, support nerves, and balance hormones. It plays a role in energy production and keeping your heartbeat steady. Signs of low magnesium include frequent muscle cramps, weak muscles, trouble sleeping, brain fog, and a racing heartbeat. Keep in mind that blood tests can miss mild shortages — serum magnesium measures the tiny amount in your blood, not what’s inside cells. If you have risk factors like heavy alcohol use, long-term proton pump inhibitors (PPIs), certain diuretics, or chronic diarrhea, get checked.
Not all magnesium supplements act the same. Here are options that actually matter in daily life:
- Magnesium glycinate: gentle on the stomach and good for sleep or anxiety. It’s a top pick if you want steady absorption without diarrhea.
- Magnesium citrate: absorbs well but can loosen stools. Use it for occasional constipation or when you need higher absorption and can tolerate mild laxative effects.
- Magnesium oxide: cheap and common, but less absorbed and more likely to cause GI upset. It often shows up in multivitamins.
- Magnesium chloride and sulfate: used for baths or topical use. Some people feel relief from muscle soreness with Epsom salt soaks, but this isn’t a reliable way to correct a deficiency.
Food sources matter. Eat leafy greens, nuts (almonds, cashews), seeds (pumpkin, chia), whole grains, beans, and fish to boost magnesium naturally.
Adults generally need about 310–420 mg daily from food and supplements combined. The tolerable upper intake for supplemental magnesium is commonly set at 350 mg/day for adults — that’s for supplements only, not food. Start with a lower dose and split it across the day to reduce stomach issues.
Talk to your doctor before taking magnesium if you have kidney disease — kidneys clear excess magnesium and impaired function can cause dangerous levels. Magnesium can interfere with some drugs: separate dosing by 2–3 hours from antibiotics like tetracyclines and fluoroquinolones, bisphosphonates, and levothyroxine. Diuretics and PPIs can lower magnesium, so medication lists matter.
Practical tip: try magnesium glycinate at night for sleep and muscle relaxation. If constipation is the main issue, magnesium citrate works but don’t overdo it. If you’re unsure whether you need a supplement, ask for a magnesium check and mention symptoms and medications — that helps your provider decide the right test and dose.
Want a quick plan? Focus on diet first, add magnesium glycinate 100–200 mg at night if sleep or cramps bother you, and review meds with your clinician. Small changes can make a big difference.
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