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They both refer to the same thing: injecting vitamin B12 into the body directly via a needle so the body can immediately utilize it

References 1 Journal of Clinical Endocrinology & MetabolismTeichman et al

However, because stomach acid is needed to release B12 from food, taking these long-term can lead to a significant drop in your levels over time

These injections are used to supplement vitamin levels in the body and are administered into the muscle of the upper arm or buttock

CYANOCOBALAMIN INJECTION, USP 1000 mcg/mL Sterile (Vitamin B12) [Label]

Vitamin B12 tablets, also known as cyanocobalamin, can be bought over the counter from pharmacies or health stores but are not as effective as the injection