sheath

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Hair growth needs perifollicular vascularization, during which VEGF is upregulated in the outer root sheath (Yano et al.
These are benign neoplasms of the outer root sheath of follicular epithelium.
The outermost cylinder is known as the outer root sheath, a structure that separates the hair follicle from the surrounding skin.
Due to its low molecular weight, SEBA oil penetrates the hair's cuticle and into the inner core and root sheath, rejuvenating hair from the inside out without producing any greasy build-up.