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Fortified foods such as breakfast cereals, plant-based milk alternatives, and nutritional yeast provide synthetic B12 (cyanocobalamin), which the body converts to active forms

Charmandari, E., Nicolaides, N

Midbrain dopaminergic inputs gate amygdala intercalated cell clusters by distinct and cooperative mechanisms in male mice

Much of the research framing treats it as an orally administered compound, and in practitioner circles it circulates in oral/sublingual forms (capsules, or the reconstituted solution taken sublingually)
B12 absorption is not a passive process
The Heartbreak of Psoriasis: A Review of Cardiovascular Risk in Patients With Psoriasis
