The five-year data shows peak results at year one followed by gradual decline, suggesting a ceiling effect where continued use maintains rather than improves hair density
The US-FDA initially approved the drug in 1942.[7] However, the compound became widely available for routine use in the treatment of B12 deficiency in the early 1950s.[8] Mechanisms of Action Cyanocobalamin is a vital compound for cell division and growth, hematopoiesis, and nucleoprotein and myelin synthesis
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Am J Physiol Renal Fluid Electrolyte Physiol 1987
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