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When juggling high-pressure jobs, family responsibilities, and social commitments

4) Blood Disorders Certain conditions affecting blood and bone marrow including some leukaemias and myeloproliferative disorders such as polycythaemia vera can cause elevated B12 due to increased production of B12binding proteins by white blood cells

2009 May;219(2):449-58

Research also shows there is no difference in the effectiveness of oral, sublingual and intramuscular supplements in raising blood vitamin B12 levels

Several case studies have been published over the years in which vitamin B12 has helped patients with delayed sleep phase disorders

Use sterile, single-use aliquots