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Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency

One example is the Jarisch-Herxheimer reaction, which may occur in those treated for syphilis or Lyme disease

The lack of immunogenicity has practical implications: the peptide can be used for extended periods without loss of efficacy due to antibody neutralization, there is minimal risk of allergic or hypersensitivity reactions, and repeated treatment cycles are supported as prior exposure does not sensitize the immune system

Users who escalate from 2.5mg of tirzepatide to 5mg and beyond sometimes notice that reactions worsen at each new dose level before stabilizing