after taking b12 injection urine color Vitamin Injections Not all that is red

Any excess is filtered out of your system and excreted through your urine

PMID 17083573

For example: Fatigue, unexplained weight loss, or abdominal pain may indicate liver disease or cancer Easy bruising, night sweats, or feeling full quickly (early satiety) may suggest a myeloproliferative disorder Swelling in the legs, reduced urine output, or persistent nausea may point to kidney disease In cases of very high B12 from injections (not oral supplements), some people have reported headache, nausea, diarrhea, facial flushing, or skin rash

- Lower Frequency: Typically, B12 shots are administered less frequently than oral supplements

This makes it an excellent option if you dont want frequent injections