We're not allowed to post links here, but here's a summary of human research on Garlic:
It's an antibiotic.
It reduces blood cholesterol.
It reduces blood clotting. (This one not good for bleeding injuries or surgeries.)
It reduces blood pressure.
It's a decongestant and expectorant.
It may damage cancer cells.
It may boost overall immune strength.
Chemical reason for effect: sulfur conpounds.