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B12 injections are typically used to treat vitamin B12 deficiency, which can cause fatigue, weakness, and other symptoms
Additionally, functional stool tests look at digestive function, markers of inflammation, and gather additional helpful clues
IV use at appropriate infusion rates has not shown the same risk profile, but medical history review is standard Individuals with a known sensitivity to sulfur-containing compounds should inform their provider High-dose IV glutathione for cosmetic skin lightening, particularly in unregulated settings, has been associated with adverse events including anaphylaxis and reports of hepatotoxicity
What Is Functional Medicine
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