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The damaging chemicals (free radicals) the body creates as a consequence of metabolism are what the term oxidative stress refers to

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Experimental studies on the biological effects of chronic low dose-rate radiation exposure in mice: overview of the studies at the institute for environmental sciences

43,44 A couple of uncontrolled studies in healthy volunteers showed significant homocysteine-lowering effects of acute administration of NAC, 7200 mg within 24 hours, 45 and 12004000 mg once, 44 with average reductions of 44% and 22%, respectively

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Therefore, before establishing expectations on B12 shots, you should talk to your doctor to see if you need to adopt a healthier lifestyle or take additional supplements in addition to B12 injections