122 citations
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April 2011 in “European Journal of Pharmaceutics and Biopharmaceutics” Particles around 100 nm can penetrate and stay in hair follicles without passing through healthy skin, making them safe for use in topical products and useful for targeted drug delivery.
263 citations
,
February 2011 in “Journal of Controlled Release” Medium-sized particles penetrate hair follicles better than smaller or larger ones, which could improve delivery of skin treatments.
26 citations
,
December 2009 in “Laser Physics” Caffeine from shampoo penetrates hair follicles quickly and stays for at least 24 hours.
33 citations
,
February 2009 in “European journal of pharmaceutics and biopharmaceutics” Pig ear skin is better than human skin for testing how well barrier creams block allergens from entering hair follicles.
46 citations
,
May 2006 in “Laser Physics” Particles similar in size to hair cells penetrate hair follicles better.