The term "hair shaft" refers to the visible part of a strand of hair that extends out from the scalp. It is the part of the hair that we can see and touch. Full definition
These omega - 3s are a necessary component of hair shaft growth, which will keep your scalp oils hydrated as well. (mindbodygreen.com)
What they did not know in detail is what happens after those stem cells move down to the base, or bulb, of hair follicles and which cells in the hair follicles produce SCF — or that cells involved in hair shaft creation make the KROX20 protein, he said. (sciencedaily.com)
The researchers observed that lead atoms penetrated hair shafts and bonded to sulfur atoms freed from protein (sciencenews.org)