Through a series of bioactivities collectively known as "vitamin D metabolism," the human body converts vitamin D from its inactive D2 (ergocalciferol) form (obtained from sunlight exposure, food, or supplements) into its active form, D3 (cholecalciferol)
Toxicol Sci 67, 322328 (2002)
Market Updates NOW Finds Quality, Potency Issues with Glutathione Supplements on Amazon The latest round of testing comes after the supplement company found issues with several other market-available ingredients
Any medications that may affect B12 (or folate) levels

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Stability & Documentation Considerations For planned series work, maintain consistent storage conditions and record the reconstitution date, solvent and target concentration in your batch notes