Garlic (Raw)

What it does

Raw garlic is the culinary bulb itself, source of allicin, which forms only when a clove is crushed and its enzyme meets its substrate. It is sold fresh, powdered, and in oil, and promoted for blood pressure, cholesterol, infections, and immunity, prominently in natural-health teaching. This record is distinct from aged garlic extract: different chemistry, different trial base, same family claims.

What the research says

• Lowers blood pressure in hypertension as part of the garlic-preparation evidence, with preparation chaos attached

  Evidence: emerging. Meta-analyses pooling garlic preparations (powders, oils, extracts) find systolic reductions around 5 to 8 points in people with hypertension and near zero at normal pressure. Raw garlic's own trials are fewer and older, and allicin yield from a crushed clove varies with preparation, time, and stomach acid, so the pooled figure is an upper bound for the kitchen form, not a promise.

• Did not lower cholesterol in the most rigorous trial, which included a raw garlic arm

  Evidence: moderate. Gardner 2007: 192 adults ate the equivalent of a fresh clove daily (blended into food, six days a week, six months) with verified supplement chemistry in the parallel arms; LDL and all other lipid measures were unchanged. The library's aged garlic record grades that claim the same way, because the same trial governs both.

• One small trial behind the fewer-colds claim

  Evidence: weak. Josling 2001: an allicin-containing supplement reported fewer colds and faster recovery than placebo over 12 weeks. Cochrane's review of garlic for the common cold found this single trial and judged the evidence insufficient. Allicin kills microbes reliably in a dish; the human infection evidence has never been built.

Raw garlic is the original form behind a preparation literature that is genuinely two-sided: blood pressure effects in hypertension at the class level, an authoritative cholesterol null that included raw garlic itself, one small cold trial, and laboratory antimicrobial data that has never been converted into human infection outcomes. Its delivery problem is the worst in the family: the active compound forms on crushing and degrades within hours, so what a buyer actually ingests varies more than the label can say. C+, one step below the standardized aged extract, for the same family evidence in a less controlled form.

Is it worth it?

Evidence (C+) sits below the leaderboard floor, so the worth-it grade is capped at C+ however inexpensive it is; the derived value lands at the cap. About $11 a month in supplement form, less as food. Derived from the October 2026 worth-it model.