oral b12 or injection Injections at Olympia Vitamin Injections vs. Oral Supplements:

South Med J

There isnt a tolerable upper intake level for vitamin B12, as its considered a vitamin with low levels of toxicity

32 Hematologic Malignancies on Intensive Therapy (Leukemias, Lymphomas, etc.) Patients with active hematologic malignancies (such as those undergoing induction or consolidation chemotherapy for acute leukemia, or aggressive chemotherapy for lymphoma) are generally high-risk for fasting and are strongly advised against it

According to a study published in Frontiers in Pharmacology, intramuscular administration of vitamin B12 produces a faster increase in serum levels compared to oral routes, although both methods are effective in restoring normal cobalamin levels in patients with deficiency

Who Needs B12 Vitamin Shots

It also helps to control the spreading of the virus in the community