who should not get b12 injections for Energy: Benefits and How It Works B12 Shots & B12 Injections:

A subcutaneous injection is used by healthcare professionals when other methods of administration are less efficient

Pancreatic polypeptide and related peptides

When patients undergo resection of a facial neoplasm, the doctor may perform plastic surgery reconstruction of the nose and septum after tumor resection

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[11] Long-term metformin therapy reduces calcium-dependent intrinsic-factor binding, lowering B12 absorption and potentially necessitating higher or more frequent parenteral doses

It occupies a different mechanistic category from cognitive peptides like Semax or energy peptides like NAD+, which means there is no redundancy in combining them