You probably know garlic as the thing that makes your fingers smell for a day. For most of us it is a kitchen habit, not a health move. The science suggests that is a missed chance, especially if you handle the clove in a very specific way.
A 2016 meta-analysis of 20 trials in the Journal of Nutrition found that daily garlic lowered systolic blood pressure (the top number) by 8.7 mmHg in people with hypertension.
Diastolic pressure (the bottom number) fell by 6.1 mmHg. That drop is roughly the size you get from a low dose of a standard blood pressure drug.
Across all 970 participants, systolic pressure fell by about 5 mmHg on average. The review also pointed to a boost in immune activity, with higher natural killer cell activity in trial reports.
Also read: They were legally blind: New treatment is helping them see again
Why raw and crushed is the key
The active substance in garlic is called allicin. It is not sitting ready inside the whole, unbroken clove. It is only produced the moment you cut, crush or chew raw garlic, when an enzyme called alliinase meets a sulfur compound in the clove.
According to the Linus Pauling Institute at Oregon State University, the reaction finishes within 10 to 60 seconds of crushing. But the enzyme is quickly destroyed by heat. Drop the garlic straight into a hot pan and the chemistry stops before much allicin can form.
That is why cooks and researchers talk about letting crushed garlic rest. The institute recommends letting crushed or chopped garlic stand for at least 10 minutes before any cooking, so the allicin can form and partially survive moderate heat.
Allicin is also where garlic's antimicrobial reputation comes from. Laboratory studies show it can slow or kill a range of bacteria and viruses, which is one reason home-remedy traditions have used raw garlic against colds and infections for centuries.
Also read: Do eggs actually raise your cholesterol? Here is what the evidence says
What this means for daily use
The everyday routine is simple. Crush or finely chop one fresh clove, leave it on the cutting board for about 10 minutes, then eat it. Stirred into cold food like a salad dressing, a dip or already-cooked pasta, more of the allicin survives.
The effect is not instant. Trials typically run from 8 to 24 weeks, and the blood pressure drop builds up over that time. Nothing in the research suggests one dramatic meal can shift the numbers.
Garlic is not a substitute for prescribed blood pressure medication, and you should not stop or change your treatment on your own. If you take blood thinners such as warfarin, or daily aspirin, talk to your doctor first.
The National Center for Complementary and Integrative Health warns that garlic supplements may increase bleeding risk, which also matters in the two weeks before any planned surgery.
Also read: Congo's deadliest Ebola is still spreading: A vaccine trial begins this month
Also read: Good reasons to add more cinnamon to your daily diet
This article is made and published by Jesper Bengtson, who may have used AI in the preparation.