•Adult intakes: mean 233 – 311 [95% CI 96
-562] mg/day
•
•Food sources: cereals (27%), drinks, meat:
supplements 1%
•
•Deficiency (mild) possible: diarrhoea,
diuretics, some women
•
•Preparations contain 50-300 mg per day
•
•GL 375 mg
•
•High intake – reduced absorption and
increased urine excretion
•
•Acute toxicity:
diarrhoea especially if
has gastrointestinal hurry
•
•Chronic toxicity:
if renal impairment –
drowsiness, hypotension and death
•
•5% to 10% of UK elderly have abnormal renal
function
•
•Excess diagnosed by: raised serum magnesium