108 citations,
November 1980 in “British Journal of Dermatology” Oral retinoids are effective for various skin conditions but have side effects and should not be used during pregnancy.
13 citations,
December 2017 in “The journal of investigative dermatology/Journal of investigative dermatology” Nicotinamide applied to the scalp can slow down hair growth.
9 citations,
July 2020 in “Experimental Dermatology” Topical L-thyroxine may help with wound healing and hair growth but should be used short-term due to potential risks.
211 citations,
February 2009 in “European journal of pharmaceutics and biopharmaceutics” Hair follicles help absorb and store topical compounds, aiding targeted drug delivery.
20 citations,
August 2014 in “Therapeutic delivery” The transfollicular route shows promise for noninvasive, targeted drug delivery but needs more research.