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B12 is water soluble, which means B12 doesnt build up in your system once youre at the appropriate amount for your body you will just eliminate any extra, so theres very little risk of an overdose

Evaluation of nebulised acetylcysteine and normal saline in the treatment of sputum retention following thoracotomy

Longhi S, Radetti G

The antioxidant effect of Zn may be beneficial in combating viral infections such as simple herpes and rhinoviruses

doi: 10.1016/j.jcjd.2016.08.228 181 OlaMSAhmedMMAbuohashishHMAl-RejaieSSAlhomidaAS

Flavonoids also reduce apoptosis by increasing Bcl2 levels and decreasing the Bax/Bcl2 ratio [50]