READING SLIP · 2007

The paper on the table

Effect of raw garlic vs commercial garlic supplements on plasma lipid concentrations in adults with moderate hypercholesterolemia: A randomized clinical trial

Gardner, C. D., Lawson, L. D., Block, E., Chatterjee, L. M., Kiazand, A., Balise, R. R., & Kraemer, H. C. · 2007

Abstract-based reading · consulted October 17, 2026. A selected teaching example, not a systematic review or dietary recommendation. Full-text methods, funding, registration and risk of bias have not been assessed.

Study design
Randomized, four-group parallel trial.
Who took part
192 adults with LDL cholesterol of 130–190 mg/dL.
Studied preparation
Raw garlic, powdered supplement or aged extract; approximately a 4 g clove equivalent, six days weekly.
Compared with
Placebo.
Time frame
Six months; fasting lipids measured monthly.
What was measured
Blood LDL cholesterol and other lipid measures.
Reported finding
None of the three garlic preparations significantly changed LDL relative to placebo under these conditions.
Uncertainty
The abstract gives standard deviations for group changes, not confidence intervals for between-group differences. A nonsignificant result does not demonstrate exact equivalence.
What this cannot tell us
This is one trial in a defined population, not a verdict on every preparation or every health outcome.
Read the source abstract ↗Bring garlic to the study table →All research-reading cards →

What does “no significant difference” leave open?

Keep the comparator beside the finding. Then ask which additional information would help you judge the size and precision of any difference.

Take this question to the next paper

Who took part? What exactly was prepared, compared, and measured? Which result remains uncertain? Keep those answers beside any claim you save. These are editorial reading prompts, not findings from the paper.

KEEP THE FOOTNOTES

Sources & further reading

  1. Gardner, C. D., Lawson, L. D., Block, E., Chatterjee, L. M., Kiazand, A., Balise, R. R., & Kraemer, H. C. · 2007

    Archives of Internal Medicine, 167(4), 346–353. Trial of 192 adults comparing raw garlic, a powdered supplement, an aged extract supplement, and placebo over six months. None of the tested garlic preparations significantly reduced LDL cholesterol. The result concerns these products, participants, and outcomes.

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