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Using a cheaper, less stable form might require a much higher dose to achieve the same effect, introducing more variables and impurities into your research

J Fam Pract

doi: 10.1007/s00204-016-1692-0
Infusing Vitamin C intravenously allows reaching plasma concentrations that would be impossible through oral intake (due to gut absorption limits)

and medication (BPC 157 (10 ng/kg, 10 g/kg i.p