High blood pressure can have a serious impact on the cardiovascular system. If hypertension is not controlled for a long time, it can lead to strokes, heart attacks and even kidney failure. A team of Australian researchers has examined this phenomenon, which affects nearly 30% of adults worldwide.
With the aim of measuring the effect of a daily consumption of black garlic on blood pressure, 79 participants with systolic hypertension were recruited and then attributed to three different doses of black garlic extract, 240, 480 or 960 mg, or placebo. The intervention was for a period of twelve consecutive weeks.
In the group receiving 480 mg black garlic extract per day, a mean decrease of 11.8 ± 5.4 mm Hg, significantly lower than the placebo group, was observed when measuring systolic pressure. Systolic pressure is when the heart contracts to expel blood. The effecacy on the diastolic pressure, the moment of relaxation of the heart, was not significant when compared to placebo.
The authors also mention that the beneficial effect of black garlic was not measured in all participants. Some saw their systolic pressure decreased by 40 mmHg, while in almost one third of participants, it reduced only by at most 5 mmHg. The researchers were unable to identify which characteristic made the treatment effective or not. In conjunction with hypertensive treatment, the results of this study are favorable to the beneficial effect of black garlic on systolic pressure.
Ried K, Frank OR, Stocks NP. Aged garlic extract reduces blood pressure in hypertensives: a dose-response trial. Eur J Clin Nutr. 2013 Jan;67(1):64-70. doi: 10.1038/ejcn.2012.178.