[DOI] [PMC free article] [PubMed] [Google Scholar] Nilsson 2005 Nilsson M, Norberg B, Hultdin J, Sandstrom H, Westman G, Lokk J
For a 5 mg vial : 5 mg = 5,000 mcg Concentration = 5,000 mcg total mL added That gives you a working concentration you can use for every draw
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Oral administration faces hepatic first-pass metabolism, reducing bioavailability to approximately 4050% of subcutaneous routes, but offers convenience for longer-term studies where daily injections create compliance challenges