Various types of garlic supplements and doses were evaluated. In most of the studies, the participants took tablets that contained garlic powder. The study duration ranged from 2 to 52 weeks.

In most of the studies, the participants had one or more health conditions (e.g., type 2 diabetes, nonalcoholic fatty liver disease), and 14 studies included participants without apparent health conditions.

Garlic improved the following compared to a control.

Garlic and cardiometabolic health markers

Outcome	Effect of garlic	Number of studies
Total cholesterol	−10.21 mg/dL	70
Triglycerides	−5.8 mg/dL	67
HDL-C	+2.18 mg/dL	65
LDL-C	−5.9 mg/dL	58
Diastolic blood pressure	−1.97 mmHg	47
Systolic blood pressure	−3.71 mmHg	46
Fasting blood glucose	−2.77 mg/dL	26
Insulin	−1.74 mU/L	7
HOMA-IR	-0.37	7
AST	−2.85 IU/L	9
C-reactive protein	−1.6 mg/L	20
TNF-alpha	−3.94 pg/mL	11
Total antioxidant capacity	+0.46 mmol/L	13
Malondialdehyde	−1.03 nmol/mL	8

The ins and outs of supplementing with garlic to improve cardiovascular health Original paper