Because B12 in the blood is continuously removed, the concentration gradient remains relatively constant
When those junctions are compromised, by NSAIDs, alcohol, chronic stress, or repeated antibiotic courses, the result is a low-grade inflammatory state that shows up as bloating, systemic fatigue, food sensitivities, and immune dysregulation
Look for third-party testing, a published Certificate of Analysis (CoA), a clearly named manufacturer, and plain serving information
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