Studying complementary and alternative health practices is a critical step in advancing all healthcare.

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The herb can cause headaches or tiredness the morning after, according to the National Institutes of Health's National Center for Complementary and Alternative Medicine.

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The doctor replied that health staff were open to families interested in using complementary therapies alongside conventional treatment.

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Traditional health insurance business profits have been capped so they are pursuing complementary businesses that are unregulated.

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"Slowly, but surely, complementary and alternative therapies are being recognised as a having health and well-being value, " he said.

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The study, which appears in the Annals of Internal Medicine, was funded by the National Center for Complementary and Alternative Medicine (part of the National Institutes of Health) and the Robert Wood Johnson Foundation.

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Ginkgo supplements were no better than a placebo for preventing dementia, according to the study, which was sponsored by the National Center for Complementary and Alternative Medicine and the National Institute on Aging of the National Institutes of Health.

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