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If you added 1mL instead of 2mL, your concentration is 5mg/mL, double what you calculated for

For dose-response studies or protocols requiring sub-milligram precision, third-party CoA verification showing actual peptide content per vial is non-negotiable

This is determined by a variety of factors including individual metabolism, overall health, and the severity of any existing B12 deficiency

The B12 vitamin is injected intramuscularly using a thin needle

If neurological symptoms worsen or fail to improve after four to six weeks of appropriate treatment , further investigation is necessary to exclude alternative diagnoses or complications