Discussion Despite several studies into the biology and genetics of hair greying or canities, the mechanism by which human scalp hairs lose pigmentation remains poorly understood, due in part to the complexity of interaction between different cell types, complex protein interactions, differential gene expression during the hair growth cycle, and variable conditions that occur within the hair follicle microenvironment 1,7,8,9,10,13,41,60,69,70,71,72,73,74
and I dont feel pain after training
However, most cases are due to excess supplementation or due to a functional deficiency, where the person is actually deficient in B12
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These might be scheduled weekly or bi-weekly, depending on your skin goals and the dermatologist's advice
doi: 10.1007/s11011-012-9287-9