The loss of enterohepatic recirculation would definitely cause an additional loss of 5mcg of B12 that is not recovered from bile
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Cyano-B12 is the most commonly used, and cheapest, form of B12 with no substantial evidence that other forms are more effective in improving B12 status
Investigations suggest that ahk-cu helps inhibit cell death (apoptosis) in these specific regions, potentially prolonging the anagen (growth) phase of the hair cycle
It makes the correct posture one of documented, conservative, research-framed use not confident self-treatment