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Oral administration faces hepatic first-pass metabolism, reducing bioavailability to approximately 4050% of subcutaneous routes, but offers convenience for longer-term studies where daily injections create compliance challenges

Dispatch Options Click and Collect In Store Available Availability In Selected Stores and Online Online Only Available Nationwide InjectaMax is an injectable supplementary source of trace minerals zinc, manganese, copper, selenium and Vitamin B12 for cattle

For example, without any intrinsic factor protein, the body will absorb only 10 mcg out of 500 mcg orally-administered vitamin B12

If youre like me and want to use B12 supplements to prevent deficiency but arent in a position where injections are necessary, you can use an oral supplement to great effect