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Why It's Designed for Single Use Only The absence of benzyl alcohol is the main reason for its design
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If vitamin B12 is ingested in its free (or nonprotein bound form), it will bind to a carrier protein known as R-binders or transcobalamin I that is secreted by both the salivary glands in the oropharynx and the gastric mucosal cells within the stomach.1,2,8 The free vitamin B12 ingested by mouth will remain in the bound form with an R-binder until it reaches the second segment of the duodenum in the small intestine
Aggregate (2025) 6(3):e707
Despite these promising findings, current evidence remains largely preclinical
Some personal care and household products can contain alcohol or other chemicals that can affect your test results
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