Black pepper essential oil to enhance intravenous catheter insertion in patients with poor vein visibility: a controlled study.
Kristiniak S, Harpel J, Breckenridge DM, Buckle J. Black pepper essential oil to enhance intravenous catheter insertion in patients with poor vein visibility: a controlled study. J Altern Complement Med. 2012 Nov; 18(11):1003-7.