11 citations,
February 2012 in “International journal of pharmaceutics” Ultrasound increases skin permeability but blocks hair follicles.
34 citations,
July 2010 in “Expert Opinion on Drug Delivery” The document concludes that there is no agreed-upon best method for measuring drug delivery within hair follicles and more research is needed to validate current techniques.
42 citations,
January 2007 in “Pediatric dermatology” Low-potency steroids can cause serious side effects in people with skin conditions like Netherton syndrome.
12 citations,
March 2012 in “ATLA. Alternatives to laboratory animals” Hair follicles significantly affect the skin absorption of some drugs.
52 citations,
February 1985 in “Archives of Dermatology” Minoxidil absorbs poorly through skin, with low risk of side effects at 1-2% concentration.