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Another crucial point is that, when an individuals antioxidant defense system is weak or saturated, inhaling additional ROS or other reactive metabolites produced by the biotransformation of chemicals in tobacco smoke can increase the amount of oxidative stress caused by the gas-phase and tar-phase derived ROS (60)

: Individuals with severe B12 deficiency, people with difficulty absorbing B12 (due to digestive conditions), or those looking for long-lasting effects from injections

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Both glutathione and NAC help maintain the cellular environment that immune cells need to work effectively