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It is not a screening test, it has never been validated as one, and no guideline recommends measuring B12 to look for cancer
Cobalamin status and its relation with depression, cognition and neuropathy in patients with type 2 diabetes mellitus using metformin
I use it combined with the NAD shots and I had energy all day long
B12 may be injected into a muscle or beneath the skin at 100 mcg every day or alternate days for 7 days, and then every 3 or 4 days for a month
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