Chiropractic is known to help numerous health and postural issues and has also been championed as an effective method of stabilising blood pressure.
In 1988 a study involving 75 individuals was undertaken in order to assess the reports that chiropractic care could help to stabilise blood pressure. The study group was split into three, with group one receiving adjustments to the thoracic spine area, another receiving placebos (movements that seemed to be adjustments but were not) and the 3rd group receiving no treatment.
The results showed that the first group who had the adjustments experienced a significant reduction in both systolic and diastolic pressure compared to the other two groups who saw no change.
Many more studies have been conducted since then and have produced similar results, often even showing the procedure has the effect of two blood pressure medications given in combination but has the added bonus of no side effects.
More information on Chiropractic can be found here.