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A multi week project may involve repeated assay runs across days, and drift in reagent sourcing can complicate comparisons

Cardiovasc Ther (2022) 2022:3159717

doi: 10.1080/15226514.2017.1319328 10 GaschlerM
IV B12 protocols involve mixing the vitamin with saline and giving it over 30 minutes to an hour

That is because there are multiple compounds which are classed as vitamin C