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Unfortunately, at the time of this writing, vitamin B12 isnt checked routinely by your medical doctor

Transforaminal epidural steroid injections in cervical spinal disease with moderate to severe disability: Comparative study in patients with or without surgery

Unlike traditional pharmaceutical interventions that may be taken indefinitely, peptides are typically administered in structured cycles to prevent receptor desensitization and allow the bodys natural homeostatic mechanisms to reset

Half Life: 8 minutes

So is the risk of using them without adequate preparation

Link to my Substack is in the comments for a more detailed discussion