Garlic cloves must be crushed or chopped in order to stimulate the process that converts alliin into the beneficial allicin. Once the garlic is cut, the active compound loses potency rapidly and can disappear completely within about an hour of chopping.
The best way to eat garlic is to take a whole, fresh clove, chop it, smash it or press it, wait a few minutes for the conversion to occur, and then eat it.
If you use jarred, powdered, or dried garlic, you won’t get all the benefits fresh garlic has to offer.
Garlic oil supplement is also very good.