All garlic supplements have some nutritional value.
However, powders and oils contain little or no water-soluble compounds that may be essential to obtain some of the key benefits of garlic. Garlic powders and oils contain some beneficial oil-soluble sulphur compounds. However, these compounds also have a pungent garlic odor as well as harsh, oxidizing side effects. Even though these products may claim to be deodorized, the garlic odor is just masked by chemical or sugar coatings. When the capsules or tablets dissolve, garlic body odor results.