Kerasal Nail's patented formula has been developed and tested by Swedish scientists over a 15 year period. Its effect and safety have been documented in several clinical trials.
The most recent clinical investigation was performed in early 2011, with the purpose of measuring early visible effects of application during 8 weeks on discolored and deformed nails resulting from onychomycosis. The study included 75 patients with a primary endpoint being the proportion of patients experiencing improvement of the target nail (according to Global Assessment Scale) after 8 weeks treatment. The following were the results.
Jan Faergemann, Sören Gullstrand, Kjell Rensfeldt. Journal of Cosmetics, Dermatological Sciences and Applications, 2011: No. 1 Vol. 3; 59-63.