is oral b12 as effective as injections vs. Intramuscular Vitamin in Vitamin B12 Deficiency • The Blood Project Sublingual B12 vs. B12 Injections:

However, protocols extending beyond 6 months in humans rely on extrapolation rather than controlled studies

Oral supplementation has shown effectiveness but may not match the efficacy of IM in certain scenarios

The ideal form of B12 to take is Methylcobalamin although a combination of methylcobalamin and adenosylcobalamin is more effective according to the National Institute of Health

On several occasions following pandemics, influenza A cross-reactive immunity has led to a level of protective herd immunity that has eliminated viral subtypes, including H1N1 in 1957, H2N2 in 1968, and seasonal H1N1 in 2009

co-supplementation with vitamin A and iron seems to ameliorate anemia more effectively than either micronutrient supplement alone (71)

People with severe anemia should be monitored for low potassium (hypokalemia), which in rare cases may lead to sudden death