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Absorption of B12 in food requires a substance from our stomachs called intrinsic factor, the production of which decreases with age People with chronic fatigue or anaemia require regular injections of vitamin B12 because the oral form is unreliable

PMID 22179958

used Rogans podcast recently to announce that the FDA would reclassify certain peptides to make it easier for compounders to produce and sell them

Additionally, while rare, high doses of B12 can sometimes cause a temporary drop in potassium levels (hypokalemia) as the body ramps up the production of new red blood cells

In some places, the sale and purchase of injectable substances without a prescription may be illegal