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However, some may experience mild side effects such as pain or redness at the injection site, headache, or nausea

At Sebastian Rose we only prescribe and administer hydroxocobalamin

A 500 mcg dose from an untested online source delivers an unknown quantity of an unknown substance

The above is usually talked of in terms of 'anaemia', but it does show that there is a complicated link between B12, B6, folic acid, zinc and vitamin D levels, chronic disease (anaemia of chronic disease) and how the body 'manages' serum iron, ferritin, and transferrin iron saturation and keeps these in balance (or not, as in your case)