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December 2007 in “BJCP. British journal of clinical pharmacology/British journal of clinical pharmacology” Hair follicles significantly increase the speed and amount of caffeine absorbed through the skin.
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February 1985 in “Archives of Dermatology” Minoxidil absorbs poorly through skin, with low risk of side effects at 1-2% concentration.
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June 1990 in “Journal of Pharmaceutical Sciences” Longer contact time increases minoxidil absorption, but doesn't affect metabolism.
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November 2009 in “Pharmaceutical Development and Technology” Transcutol P best increases Finasteride absorption for hair loss treatment.
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January 1968 in “THE JOURNAL OF VITAMINOLOGY” α-Tocopheryl acetate is well absorbed through healthy skin.