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He claims no major side effects other than empty pockets from not knowing legitimate sources and going around in circles

Insulin-like growth factor (IGF)-I, IGF binding protein-3, and cancer risk: systematic review and meta-regression analysis

"I received six B12 injections from a nurse at my surgery (and scheduled for three monthly for further injections)." That's a UK treatment pattern for B12 deficiency without neurological symptoms

Approved products have authorized labeling, defined indications, established dosing instructions, and regulated safety information

You smoke or drink alcohol excessively

Those differences determine confidence that the product inside the vial actually meets the spec it claims to meet