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symptoms of too much b12 injection Vitamin Side Effects and Safety Too Much Vitamin B12: Risks,
Description
This is not always a symptom nor a primary symptom

From there it does a few jobs

Recent trials have explored other precursors beyond NR

Research conducted by the NIH has suggested that transcobalamin plays a role in the suppression of systemic inflammation, specifically by reducing the levels of interleukin-6 and other inflammatory growth factors [4]

People with megaloblastic anemia, some gut problems, or malabsorption might need both
For oral GHK-Cu, follow the serving size on the product label