b12 injection administration site Safe Guide at Home How To Give Yourself A
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JCI Insight

However my daughter has found an article on the internet saying there can be serious health consequences of having B12 injections and drinking alcohol

B12 deficiency is among the most common B-vitamin deficiencies because it is not naturally found in plant foods, and several health or lifestyle factors can reduce absorption

Rajan S, Wallace JI, Brodkin KI, Beresford SA, Allen RH, Stabler SP
There are no known cases where a vitamin B12 injection has impacted the effectiveness or caused complications with current COVID vaccine programmes
