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Passive diffusion: the primary absorption mechanism Unlike the small intestine, which has specialized transporter proteins that actively shuttle certain molecules across the gut wall, the sublingual mucosa relies almost entirely on passive diffusion

doi:10.1016/j.glmedi.2024.100081 5

70 Chen, Y.-C., Lu, P.-H
The Comedy Store, you had to

B12 is naturally made by bacteria in soil and water but can be grown in industrial-sized vats for use as supplements

If you have more B12 than the body needs and is able to absorb, the excess is excreted in urine (EFSA, 2015
