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This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged
AHK-Cu is often more effective when the main concern is scalp health and hair density, especially in antithinning routines
Switching to preservative-free formulations typically resolves the issue for people who need b12 but react to standard preparations
The rest of the process is the same, so proceed to the next steps
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