So let's dive deeper into the details
1 mg equals 1000 mcg
However, this difference has no clinical significance
References Htut TW, Thein KZ, Oo TH

Important Safety Information Do not use AOD-9604 if you: Have a known hypersensitivity to growth hormone fragments or any component of the formulation Have active malignancy (cancer that is currently being treated or monitored) Are pregnant or breastfeeding (insufficient safety data) Have a history of severe allergic reactions to peptide therapies Common side effects (typically mild and transient): Headache, mild gastrointestinal disturbances (flatulence, mild diarrhea at higher doses), upper respiratory tract symptoms, injection site reactions (redness, mild discomfort) Seek medical attention if you experience: Signs of allergic reaction (hives, difficulty breathing, swelling of face or throat), persistent gastrointestinal symptoms, unexplained significant changes in energy, mood, or physical symptoms Clinical Safety Data Safety studies involving approximately 900 participants across six randomized controlled trials documented that AOD-9604 displayed a very good safety and tolerability profile indistinguishable from placebo across most parameters

There is also recent data which suggest that genetic alterations of the receptor by which B12 is transported into nerve tissue and the brain, may lead to a lower B12 uptake