Because the intranasal forms have lower absorption than the IM dosage form, intranasal B12 forms are administered once weekly
While B12 can be obtained through dietary sources, some individuals may have difficulty absorbing it effectively, leading to deficiency

(ii) May count towards certification of the participant in a specialty or subspecialty listed in the current edition of either of the following publications, provided that listing in either of those publications, or in successor information sources, does not require the program to promote or encourage discrimination on the basis of race, color, national origin, sex, age, disability, or religion, including the use of those characteristics or intentional proxies for those characteristics as a ( selection criterion for employment, program participation, resource allocation, or similar activities, opportunities, or benefits: (A) The Directory of Graduate Medical Education Programs published by the American Medical Association, and available from American Medical Association, Department of Directories and Publications, 515 North State Street, Chicago, Illinois 60610

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Medical studies have shown that a greater number of people don't get enough B vitamins strictly from eating B-rich foods