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Endocrinology, 142(12), 51825189

[6] Patients with a history of severe allergic reactions to similar injectable vitamins should not receive this product, or should undergo desensitization under close medical supervision if the therapy is deemed essential

The pressing question, however, is whether Medicare provides coverage for these injections

The rapid attainment of peak plasma levels with parenteral administration makes this formulation particularly suitable for acute correction of deficiency states or for protocols requiring high systemic exposure

Insufficient intrinsic factor production, common in older adults due to age-related absorption decline, can also lead to deficiency