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feeling tired after vitamin b12 injection makes me sleepy How Soon Do You Feel Less a B12 Injection? Vitamin B12 Deficiency: Symptoms, Causes
Description
When it comes down to it, a vitamin B12 shot can significantly impact your energy levels if you are B12 deficient
The pleasant taste of many sublingual formulations (often cherry or berry flavoured) may also enhance compliance compared to standard supplements

Although there are vitamin B12 tablets, the shot seems to be more effective, boosting your levels more quickly and efficiently
Good luck.