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It could be that you need to adjust the dosage and/or frequency of application

The specific shade you see depends on several factors: the concentration of B12 in your formulation, which form of B12 the pharmacy used, the total volume of solution in the vial, and how the medication has been stored since it left the compounding facility

PMID: 574316, DOI: 10.1126/science.574316

or any kind of cognitive impairment. But, she emphasized, they will help people in the lower end of the ability range more than in the higher end. One explanation for this phenomenon might be that, the more adept you are at a given task, the less room you have to improve