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too much b12 injection side effects Vitamin Effects: How is Much? Vitamin B12 Injections | Energy
Description
Alternate injection sites include the outer thigh or upper arm fatty tissue if rotating sites to prevent lipohypertrophy (tissue buildup from repeated injections)

In other words, it can break down through photolysis (destruction by light) unless you store it properly

This reflects its different chemical nature as a small molecule rather than a peptide

Will Changing My B12 Dose Help With the Symptoms