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Inject a couple milliliters of air into the vial
Baltaci, Davut, et al
Discard the pens after 28 days even if they are not expired
The most chemically complex of all the vitamins, methylcobalamin is a water-soluble, organometallic compound with a trivalent cobalt ion bound inside a corrin ring which, although similar to the porphyrin ring found in heme, chlorophyll, and cytochrome, has two of the pyrrole rings directly bonded
You do get B12 in foods such as red meat, poultry, fish, and eggs
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