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Updated April 2022
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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.Read more 
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We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

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If you have dry, brittle nails that crack, peel, and break easily, a protein nail formula can restore their strength and beauty. Chances are, if you have been a serial salon manicure recipient (especially with acrylics and hard-to-remove gel polishes), your nails have become thin. A nail protein formula goes on just like a polish or topcoat, fortifying the nail so that it grows in thicker and stronger. With ingredients like collagen and protein, these often work well as base coats before you apply your normal colored lacquer. And the price is much less than going to the nail salon, at under $15 a bottle for most brands.

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