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Description
In general, popping an over-the-counter vitamin B12 is unlikely to harm your healtheven in doses up to 1000 mcg

However, this hypothesis needs to be confirmed in further clinical studies
doi: 10.1016/j.atherosclerosis.2020.10.014
M.Perez-GironJ

Nebulized enriched heparin improves respiratory parameters in patients with COVID-19: a phase I/II randomized and triple-blind clinical trial