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Cleveland Clinic makes a similar point in a 2026 explainer: IV vitamin therapy can be useful in specific situations, but is often oversold

Jan 2015;94(1):65-71

10.1159/000447841 178 YangF.YangL.LiY.YanG.FengC.LiuT.et al (2017)

Data was self-reported by 1,412 surveyed customers who checked in with their provider between second and third check-in
