Same technique as Mounjaro here's the step-by-step guide
A physician investigating unexplained hypercobalaminemia will typically order some combination of the following: Complete blood count (CBC) with differential to check for abnormal red blood cell, white blood cell, or platelet counts Liver function tests (ALT, AST, ALP, bilirubin, albumin) to assess liver health Kidney function tests (creatinine, BUN, estimated GFR) to evaluate renal clearance Peripheral blood smear if a myeloproliferative disorder is suspected Abdominal imaging (ultrasound or CT) if liver or abdominal pathology is a concern Cancer-specific markers or screenings if clinical suspicion warrants them The NIH Office of Dietary Supplements fact sheet notes that observational data from a Danish registry analysis of 757,185 people found the adjusted 1-year cancer risk was 1.74 to 4.72 times higher among those with B12 above 813 pg/mL compared to those in the normal range of 203 to 813 pg/mL

Hematology and Iron Testing Complete Blood Count with Differential and Platelets Ferritin, Iron and TIBC Panel Ferritin, Iron and Total Iron-Binding Capacity Panel These Ulta Lab Tests pages cover blood-cell assessment and iron storage and transport markers
Selank Selank is an anti-anxiety and nootropic (brain-boosting) peptide being researched for its ability to balance neurotransmitters like serotonin, dopamine, and norepinephrine (31)
Its important to understand the standard dosages for B12 injections in adults