One study found that when people with mild cognitive issues and low levels of B12 were given B12 vitamins, most of them showed improved cognitive symptoms
Other patients may take a few days or weeks before noticing a significant difference
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Zhong Y, Anderl F, Kruse T, Schindele F, Jagusztyn-Krynicka EK, Fischer W, Gerhard M, Mejas-Luque R (2016) Helicobacter pylori HP0231 influences bacterial virulence and is essential for gastric colonization
The semaglutide and energy article is worth reading if you are concerned about how caloric restriction during treatment affects daily vitality, and the insomnia article addresses sleep disruption specifically
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