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Description
The vitamins may take some time to fully absorb into the body, meaning with injections it may take a few days or weeks before the effects are noticeable, and may take a bit longer for vitamin supplements, but at the recommendation of a doctor, you should feel better with the correct amount of vitamin B12 being taken regularly

What is the difference between sermorelin injections and sermorelin pills

doi: 10.1016/0009-2797(93)90113-D
doi: 10.1007/978-981-99-1463-0_1 213 SundararamanARayMRavindraPVHalamiPM

Hammersley D, Signy M
Conclusion Vitamin B12 is more than just a nutrient
