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Glutathione synthesis

The NHS gives its standard hydroxocobalamin treatment as an intramuscular injection, usually delivered by a nurse or doctor

Martindale: the complete drug reference, 34th ed

A syringe that is too large for a small dose can be difficult to control, while a syringe that is too small for a large dose may require multiple injections, causing unnecessary discomfort

Anything higher than that quickly becomes too much volume for one subQ site, which is why oral capsules are the standard route

roughly 50-98 % of an administered dose is renally excreted unmetabolized, underscoring the low intrinsic toxicity