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A lack of it might be why sticking to diets or exercise routines feels so hard
Some people pursue vitamin B12 shots because they believe that doing so will increase their energy levels
That being said, neither study specifically states how much one must take of vitamin B12 (or folate) for their blood serum levels to register as either "very high" or "extremely high." For that reason, although vitamin B12 (and folate) supplementation are important during pregnancy, it's best to look to your healthcare provider for guidance
The following three-test approach, described by Carmel (2008, Annual Review of Nutrition), gives a more complete picture: Serum B12
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