Magnesium

Magnesium is involved in hundreds of processes in the body, including muscle and nerve function, energy production and keeping a steady heartbeat. Good food sources include nuts, seeds, pulses, wholegrains and leafy green vegetables.

Most healthy people who eat a varied diet get enough magnesium. Supplements are sometimes used when intake is low or a clinician advises them. Claims that magnesium helps sleep or muscle cramps are common, but the evidence is mixed and varies by person.

Supplements come in different forms, and higher doses can cause diarrhoea and stomach upset. People with kidney disease should speak to a doctor before taking magnesium, and it can interact with some medicines, including certain antibiotics, so check with a pharmacist.