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Medically necessary home infusions are treatments prescribed by doctors for specific medical conditions like high-dose antibiotics for stubborn infections, total parenteral nutrition (TPN) for people who can't eat normally, or chemotherapy delivered at home

As they require a prescription, you cannot simply purchase them at a pharmacy without a doctor's order

Biologically active vitamin B12 compounds in foods for preventing deficiency among vegetarians and elderly subjects

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It allows for more accurate study design, as you can be more confident in the actual amount of the compound interacting with target tissues