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the modern medical science thinks that the decay is the process of acidification of matter (oxidation).absorb o2, drinking and smoking, environmental pollution etc could produce oxygen radicals in human body. this could vandalize the cell tissue, genetic disease and aging in the body. hydrogen could effectively remove radicals in the body.hydrogen anti-oxidation is much more powerful than vitamin c, carrot, lecithin etc people already familiared antioxidative substance.