Urea is already a component of Kerasal (salicylic acid and urea) so why do you have to mix Kerasal with urea? Either salicylic acid or urea are safe for the nail but I doubt any therapeutic effect on your nail's condition.
Answered 12/18/2021
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It has recently been reported not all nail dystrophy problem with toe nails are caused by fungus alone. It has been shown bacteria are / can be involved
Answered 12/18/2021
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