However, research has definitely confirmed that a deficiency in this essential vitamin is harmful to the body and the brain, with worse deficiencies generally causing greater harm
Once reconstituted with bacteriostatic water, the solution should be kept refrigerated and used within 30 days
However, some plants like garden cress can absorb B12 from the soil, as long as it is not deficient

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The FDAs unapproved drugs page also explains that products without approval cannot be sold for human use