Yes, there are special B12 shots like Tiaminal B12
Journal of Pharmacy & Pharmaceutical Sciences
In the case of water-soluble vitamins like B12, vitamin C, folic acid, and other B vitamins, some medically reviewed literature points to early morning as the optimal time to take them as they can be taken on an empty stomach, but more peer-reviewed research is needed to confirm this claim
The traditional way of diagnosing has been with a serum B12 blood test, however many sufferers of a B12 deficiency may not have anaemia, or have a serum B12 blood level within an abnormally low range in accordance to the normal ranges set
Persistent or severe symptoms suggest dose reduction or potential sensitivity
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