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The cost of one wasted vial is trivial compared to the consequences of consistent over or under-dosing across weeks of your protocol
Oral protocols Results from oral use are less noticeable and take longer to start than those from injections
Practically, if you are on a dose above 5mg, you may want to consider larger vial sizes
Frequently asked questions about metformin and B12 How long do I need to be on metformin before B12 becomes a concern
It is important to accomplish the stick in one, rapid movement
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