The dose landing in fat instead of muscle B12 is given as an intramuscular injection for a reason: muscle has the blood supply to absorb it steadily
Hevert - Medicines - naturopathy and vital substances
"Dietary Reference Intakes for Japanese 2010: Water-Soluble Vitamins" Journal of Nutritional Science and Vitaminology 2013(59):S67S82
Iron Overload : Excessive iron can accumulate in the body, leading to a condition called hemochromatosis, though this is uncommon
What HRT Options Are Available
The NHS lists the common symptoms as: Persistent tiredness, breathlessness and a lack of energy Pins and needles, numbness or tingling in the hands and feet A sore, red tongue and mouth ulcers Problems with memory, concentration and mood Pale or slightly yellow-tinged skin If several of these sound familiar and you are on long-term metformin, that is a good reason to ask your GP for a B12 blood test rather than to book an injection straight away