We give weekly injections of 1000 mcg (1 ml) of vitamin B12 for the first 4-6 weeks
This isn't just theory
The same studies can be located independently on PubMed using the CAS number (221231-10-3) or the compound name

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Public Health Division of the Welsh Government reply We have received a reply from the Public Health Division of the Welsh Government re-assuring us that stocks of vitamin B12 injections are not affected by the current situation with COVID-19, and that when a patients has made an appointment, an assessment needs to be made on the day to determine whether the patient has any of the symptoms of infection
Some people also give themselves injections under the skin