Chopping or crushing fresh raw garlic cloves leaves cells damaged, allowing the precursor alliin and the enzyme alliinase to mix and rapidly form allicin upon reaction. Allicin Health Allow chopped garlic to sit for 5-10 minutes before cooking to maximize allicin production. Stomach acid also further induces allicin formation when raw garlic is consumed. High-allicin garlic supplements also deliver stable, bioavailable allicin.