Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
RCT Crossover design	45 people with at least 6 cramps during the previous month In review	Diarrhoea, nausea, and vomiting 11% with magnesium 10% with placebo	Significance not assessed
RCT Crossover design	68 people with at least 2 leg cramps per week for 3 months In review	Diarrhoea 30% with magnesium 17% with placebo Absolute numbers not reported	P = 0.1		Not significant
Systematic review	People with cramps	Adverse effects with magnesium with placebo	Significance not assessed