Botanical guide · Ingredient reference

Three garlic preparations and LDL: a six-month trial found no reduction

A controlled study tested raw garlic, powdered garlic and aged extract. None significantly lowered LDL cholesterol compared with placebo.

Read the evidence ↓

Supplement Science Insights Editorial Team

Published September 23, 2026

The study and its comparison

One hundred ninety-two adults with moderately elevated LDL were randomized to four groups. The preparations supplied roughly a clove-equivalent amount six days weekly for six months. [1]

Investigators monitored blood lipids monthly and chemically characterized the study materials. LDL, HDL, triglyceride and cholesterol-ratio results did not show a significant benefit from any tested garlic preparation. [1]

What the finding establishes

The negative finding should remain visible even when other research suggests a plausible cholesterol mechanism. It does not establish every possible garlic regimen’s effect, but it directly tests several common forms. Funding and conflicts were not fully established from the retrieved abstract. A familiar food name is not evidence of a dependable lipid-lowering treatment. [1]

A hypothetical distinction

Imagine several preparations are tested and all yield a null result. Choosing the most natural-sounding form does not change that comparison.

Interpretation checklist — Three garlic preparations and LDL
DetailInterpretation
Measured outcomeKeep the endpoint specific
Study preparationNot every retail product
Remaining uncertaintyNot resolved by a mechanism
Three garlic preparations and LDL: a six-month trial found no reduction — original article outline diagram
Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

Sources for this article

  1. Effect of raw garlic vs commercial garlic supplements on plasma lipid concentrations in adults with moderate hypercholesterolemia: a randomized clinical trial.
    Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.