Consumption of raw garlic, as well as garlic supplements, can be used to lower hypertension and keep one's blood pressure within acceptable limits. It contains a chemical called hydrogen sulfide which helps to relax the smooth muscles and blood vessels of the body, eliminating the need of the body to pump blood under high pressure. Garlic also contains a small peptide linkage which can effectively prevent the generation of a specific hormone which can cause blood pressure to rise.

Lab tests have shown that consumption of certain doses of garlic supplements can cause systolic blood pressure to drop within a short time of taking them, indicating that it is indeed a powerful natural antihypertensive substance, with no mentionable side-effects. In certain cases, garlic has been observed to perform on par with dedicated blood pressure medications such as beta blockers, even when supplied in very small amounts.

Garlic has been used to treat high blood pressure conditions in many oriental nations such as Japan and China for hundreds of years. It is considered to be the very best natural antihypertensive medication, and it can also treat hypotension as well as hypertension. However, fresh, organic garlic has a much more powerful effect than garlic supplements on patients.