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FDA.gov (2026) 12
Kidney or Liver Disease: Individuals with kidney or liver disease should exercise caution when considering B12 shots
Diet: Adequate protein and animal product intake supports endogenous B12 levels
Uptake of cobalamin and markers of cobalamin status: a longitudinal study of healthy pregnant women
Here are some general guidelines to consider: Initial Treatment: For those with a significant deficiency, weekly injections may be recommended initially to rapidly build up Vitamin B12 levels
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