In summary, Vitamin B12 itself does not cause weight gain

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For context, purchasing BPC-157, TB-500, GHK-Cu, and KPV individually through separate prescriptions would typically cost significantly more per month, plus you would need to manage four separate products, dosing schedules, and injection protocols
[21] Neurological symptoms: Sensory or motor deficiencies (absent reflexes, diminished vibration or soft touch sensation), subacute combined degeneration of spinal cord, or seizures
Almost no source treats them separately which is exactly why so much conflicting information exists on this topic