 As of 2015, clinical research to determine the effects of consuming garlic on hypertension found that consuming garlic produces only a small reduction in blood pressure (4 mmHg), and there is no clear long-term effect on cardiovascular morbidity and mortality.A 2016 meta-analysis indicated there was no effect of garlic consumption on blood levels of lipoprotein(a), a biomarker of atherosclerosis.Because garlic might reduce platelet aggregation, people taking anticoagulant medication are cautioned about consuming garlic.