Amazon Customers Say This Best-Selling Treatment Is the Key to Beautiful Nails

Amazon Customers Say This Best-Selling Treatment Is the Key to Beautiful Nails There are tons of treatments that promise indestructible nails. One has risen to the top as a customer favorite on Amazon: Onyx Hard As Hoof Nail Strengthening Cream. It's the best-selling nail treatment on Amazon and was on Amazon's overall beauty best-sellers list. It also has over 1,400 positive reviews on Amazon. Onyx claims the cream "prevents splits, chips, peels & cracks on even the most severe cases." Judging by Amazon reviews, that's actually the case.