Kerasal Nail Renewal, Restores Appearance of Discolored or Damaged Nails, 0.33 fl oz (Packaging May Vary) Kerasal Nail Renewal helps reduce discoloration and thickness, as well as hydrate and exfoliate brittle nails to improve the appearance of damaged nails. Kerasal Multi-Purpose Nail Repair, Nail Solution for Discolored and Damaged Nails, 0.43 fl oz Kerasal Multi Purpose Nail Repair helps reduce discoloration and thickness, as well as hydrate and exfoliate brittle nails to improve the appearance of damaged nails.