Garlic is mostly known to protect against stomach cancer. It can also regulate the amount of inflammatory activity in body cells. Garlic has allyl - sulfides that are involved in helping the body to prevent formation of cancer cells, by helping normal cells respond to oxidative stress. In the face of such stress, allyl - sulfides in garlic helps the cell to dismantle itself, thus lowering the production of cells that might become cancerous. This also can free up cellular material that can be recycled for future cellular production of healthy normal cells.
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From @tasin12