The Ebers Papyrus (c. 1550 BC) prescribes the use of garlic in cases of high blood pressure and clogged arteries.
It is a widely-researched species and is a popular herbal supplement cleared for use in the US, Europe, and across the globe. The plant effectively reduces high blood pressure, showing promise in reducing cardiovascular risk (Ackermann et al., 2001).
However, before you start self-medicating, do not forget that herbs and food can negatively interact with the body.
Borelli et al. (2007) performed a study that reveals adverse interactions of garlic with certain drugs. Isoniazid is used to treat tuberculosis, and in birth control pills, the cyclosporine is given after organ transplant. Blood-thinning medications could all be made less effective when patients take garlic supplements.
Therefore, it is suggested that you consult your physician before consuming garlic or any other herbal and other formulations.
Books on herbs and herbal medicine: