Garlic enhances immunity by promoting production of vital immune system components: white blood cells and cytokines IL-2, IFN-gamma, IL-4, and IL-10. Garlic is thought to be protect blood vessels from injury by reducing oxidative stress, inhibiting low-density lipoprotein (LDL) oxidation, and preventing blood clots. Preliminary clinical research suggests some compounds in Garlic, such as S-methylcysteine sulfoxide and S-allylcysteine sulfoxide, sustain normal blood sugar.