The study involved 140 dementia sufferers who were questioned about their use of herbal extracts and vitamins and whether they informed their doctor about their use.
A total of 44 per cent of patients reported taking one or more supplements.
The majority of patients, 79 per cent, were unaware of the potential side-effects of taking supplements and 71 per cent were unaware of any interactions with other medications.
The findings, presented at the Royal College of Psychiatrists' Annual Meeting in London this week, suggest that there is a need for urgent action to educate dementia patients.
Annual Meeting of the Royal College of Psychiatrists
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