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The tests can also give false readings where they do not assess the bioavailability of the B12 or whether it is functional or not
However, observational studies suggest that whilst acute toxicity remains exceptionally rare, sustained very high levels of B12particularly from supplements or injectionsmay be associated with certain health concerns, though these are correlations rather than proven causal relationships
One Reddit user, who later spoke with STAT News/Undark, described living with hypermobility spectrum disorder, a condition that at its worst made it impossible to even walk around the block. He wanted to strengthen the muscles around his joints, but was so injury-prone that workouts often left him feeling worse
10.1016/j.neuroscience.2019.03.025 Neuroscience 129 MakhobaX
