The side effects of magnesium include nausea, diarrhea, stomach pain, arrhythmias, dyspnea, hypotension,... To minimize the risk of side effects and drug interactions, magnesium supplements should only be taken as prescribed by a doctor

Some people with insomnia take magnesium B6 to improve their sleep. Theoretically, magnesium can calm the central nervous system and is effective in cases where mineral deficiencies affect sleep.