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For thin, flimsy nails that tend to break easily, use Nutra Nail Invisible Flex Hardener. This hardener coats nails with a supportive layer to reinforce their natural structure. Your nails will feel harder and be less prone to splitting and breaking. Nutra Nail Invisible Flex Hardener is fast-acting and will help protect nails instantly. Comes in a .5 fluid oz. / 15ml bottle. Nutra Nail is a leading brand in the nail treatment category and has a comprehensive collection that includes top coats, strengtheners, hardeners, growth products, and cuticle products. All to give you stronger, longer, more beautiful nails at an affordable price! Making natural nails beautiful.