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Different B12 injections
[1] [3] It occurs in only about 2-3% of the population over the age of 65
This can be due to viral infections (like dengue, hepatitis C), vitamin deficiencies (B12, folate), aplastic anemia, or as a side effect of chemotherapy and radiation
Variants are pathway-level: they don't predict response to any specific compound, but they describe the metabolic and longevity terrain a clinician is prescribing into
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