does oral b12 work as well as injections How Quickly Vitamin Injection B12 Injection vs. Oral Supplements:

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A 25 to 27 gauge needle is appropriate, as it minimizes discomfort and is sufficient for penetrating the subcutaneous layer without reaching the muscle

doi: 10.1097/MCO.0b013e32832cdaae

A researcher orders a 50mg vial of 5-Amino-1MQ, adds 2mL of bacteriostatic water assuming they now have '50mg per dose,' and administers double the intended amount because they never converted milligrams of powder into milligrams per milliliter of solution