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Jun 1990;3(2):121-127
MTHFR and Vitamin B12 Absorption The MTHFR genetic mutation has a negative effect on B12 absorption, with studies showing an increased prevalence of low blood levels of vitamin B12 in those with the mutation

its the potential for 1+1=3

Why Are My Vitamin B12 Levels Low

In general, glutathione injections are thought to be more efficient than tablets in terms of quick absorption and durable effects

& Dunne, D
