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If your lab can measure this, it might be the single best way to fine-tune your dose

Seek immediate help for signs of allergic reaction or if you have red flag symptoms, are pregnant, immunosuppressed, or elderly

It is also used for brain and nerve cell development, and brain function

However, men on therapy require periodic prostate monitoring through PSA testing and digital rectal examination, as testosterone can stimulate the growth of existing, undiagnosed malignancies

These include: Vegetarians and vegans, as vitamin B12 is mainly found in animal products Older adults, as they absorb vitamin B12 less well with age People with gastrointestinal disorders, like celiac disease or Crohns disease, which can block vitamin B12 absorption Those taking certain medications, such as proton pump inhibitors or metformin, which can also block vitamin B12 absorption Its best to talk to a healthcare professional about whether you need vitamin B12 supplements