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Unlike tablets, which have to pass through your digestive system, an injection goes straight into the bloodstream

They may use regular blood tests to monitor your B12 levels and adjust your injection schedule accordingly

In such cases, self-injection kits offer a practical way to keep the cost of B12 injections low

Verified Answer Once the bottle is opened, is there an expiration date

Transferrin saturation: A blood test that measures the percentage of iron bound to the transport protein transferrin

The standardized nature of the capsule formulation ensures precise dosage control in in vitro experiments and reduces experimental errors