TL;DR: it may make your trips to the bathroom more regular (11)
Many growth factors such as transforming growth factor (TGF)-,2 platelet-derived growth factor (PDGF),3 epidermal growth factor (EGF),4 and fibroblast growth factor (FGF),5 as well as interleukin (IL)-16 and tumor necrosis factor (TNF),7 have been evaluated in a wide spectrum of in vivo and in vitro experiments to observe their effects on different elements included in the healing process
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Since nerve conditions are sometimes due to a vitamin deficiency, a doctor might suggest B12 injections to ensure enough of the vitamin gets into your bloodstream and to the affected nerve.
The clear separation between treatment and placebo groups (5272 vs 9.6 hairs) leaves little room for doubt about efficacy
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