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Description
That longer action is part of why maintenance injections can be spaced months apart rather than weeks
The NHS advises that supplements containing up to 2mg (2000 micrograms) daily are safe for most people

For patients with a deficiency, B12 injections may help restore healthy levels and support improved energy and overall wellness

They are designed to support specific systems such as blood flow, neural signaling, energy metabolism, or antioxidant defense rather than replace or suppress hormones
