website called Research Square
Vit B12 and deficiency as Cofactors of Covid 19 - induced Chronic neurological adverse reactions.
For those who like to delve in to scientific papers, with an interest of B12 .This is a recent Medical Paper (which is being updated regularly) by medical Specialist.
Both the Influenca Vaccine and Covid 19 Vaccine Mentioned
"To our knowledge the Role of vitamin B12 deficiency has not been properly investigated as part of these responses"