You can certainly combine the shots in the same syringe, but I do not recommend it (unless you are an expert), because if you get an air bubble in the syringe, as you extract the liquid from the vial, you will need to slowly return the liquid into the vial and re-extract it again till theres no bubbles
The needle goes below your skin, and it doesnt reach deep
Naturally, vitamin B12 is found in animal products such as red meat, fish, eggs, milk, and poultry, but it is low in plant foods
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A healthcare provider can guide you on the best approach based on your dietary preferences
Have no probs doing it myself though