There are several other supplements that may well be useful for controlling hypertension, although the level of research evidence may not yet be as great as the level of their use among alternative and complementary medicine practitioners. Several species of hawthorn (Crataegus spp.) have garnered some research interest. In a recent double-blinded study of Iranian C. curvisepala, 92 subjects took either the hawthorn extract or a placebo for more than four months, and these produced significant drops in both systolic and diastolic blood pressure three months into the study.11 An additional pilot study showed a favorable trend toward reduced hypertension for hawthorn extract but the results did not reach statistical significance.12 Traditionally, this herb has been used as a heart tonic, and is used extensively for patients with chronic heart failure. What is important to note is that, in the practice setting, the full benefits of hawthorn in the proper dosages may take approximately six to eight weeks to be clinically observable.
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