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This is usually an indication that you have a methylation defect and need to slow down on the amount of B12 you are taking
Most people get enough B12 from their diet, but many have absorption issues that mean adequate intake doesnt translate into adequate cellular levels
S2CID 38243275
Mild to moderate deficiencies of vitamin B12 are fairly common, with about 40% of people in Western populations reported to experience them [1]
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Even more specifically, rats studied predominantly by one research group in Zagreb, Croatia
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