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Dose: Most vitamin B12 supplements contain rather high doses
Products sold online without a prescription requirement, through general retail platforms, or without third-party testing documentation are often unreliable in purity, inaccurate in concentration, or in some cases unsafe due to contamination
Smoking and Pollution Exposure Cigarette smoke introduces a massive amount of free radicals into the lungs and bloodstream, and pollution from traffic and industrial areas does the same
Tolerance development : Effects diminish over time, requiring higher doses
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