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If you have received a coronary stent, you should consult with your clinician before having B12 injections as certain interactions between B12 and other vitamin supplements can increase the risk of blood vessel narrowing
Building tolerance over time The immune system adapts
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Photodegradation of Methylcobalamin and Its Determination in a Commercial Formulation This paper presents a transient absorption study of the primary photolysis of ethyl- and n-propylcobalamin in water and a comparison of the photolysis of methyl-, ethyl-,n-propyl-, and adenosylcobalamin at two different excitation wavelengths
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