Kandungan Allicin, Diallyl Sulphide, S-Allylcysteine dari bawang hitam berfungsi sebagai antiplatelet (mencegah terjadinya penggumpalan sel-sel pembeku di pembuluh darah), mengontrol pompa ion Na & K yang berperan penting dalam aktivitas jantung saat memompa darah, Membantu proses relaksasi dan vasodilatasi (pelebaran) pembuluh darah untuk mencegah penyumbatan pada pembuluh darah, menurunkan kolesterol

Garlic supplements have shown promise in the treatment of uncontrolled hypertension, lowering blood pressure (BP) by about 10 mmHg systolic and 8 mmHg diastolic, similar to standard BP medication. Aged garlic extract, which contains S-allylcysteine as the bioactive sulfur compound, in particular is standardizable and highly tolerable, with little or no known harmful interaction when taken with other BP-reducing or blood-thinning medication. Here we describe biologically plausible mechanisms of garlic’s BP-lowering effect. Garlic-derived polysulfides stimulate the production of the vascular gasotransmitter hydrogen sulfide (H2S) and enhance the regulation of endothelial nitric oxide (NO), which induce smooth muscle cell relaxation, vasodilation, and BP reduction. Several dietary and genetic factors influence the efficiency of the H2S and NO signaling pathways and may contribute to the development of hypertension. Sulfur deficiency might play a part in the etiology of hypertension, and could be alleviated with supplementation of organosulfur compounds derived from garlic.