We have never compared Piggy Paste to Kerasal Nail in a clinical study, but here are a few things to consider:Kerasal Nail lists propylene glycol, urea and lactic acid as their ingredients. Piggy Paste has propylene glycol, acidic acid and thymol as its primary ingredients.Kerasal Nail contains 0.33 ounces of product in its retail package. Piggy Paste contains 0.8 ounces of product in its retail package, more than two times the amount that’s in Kerasal.In a consumer survey of over 350 people who used Piggy Paste for 12 weeks or longer, over 75% of people said they saw an improvement in their nail appearance.