- Pyridoxine supplementation protects mice from suppression of contact hypersensitivity induced by 2-acetyl-4-tetrahydroxybutylimidazole (THI), ultraviolet B radiation (280-320 nm), or cis-urocanic acid. Reeve, V.E., Bosnic, M., Boehm-Wilcox, C., Cope, R.B. Am. J. Clin. Nutr. (1995)