While there's a slew of hair-strengthening products on the market, Viviscal's Thickening Shampoo should be at the top of your Amazon wishlist, especially while it's on sale for just $10 before Amazon Prime Day has even begun.

The brand behind one of Amazon's top-selling anti-thinning shampoos and conditioners has unveiled an even more potent formula. You're getting the same powerful cocktail of 17 DHT blockers with 1.5 times the concentration of the original blend, so it's more bang for your buck (especially since the regular-strength set isn't on sale, either).

But many customers say it also helped their hair grow back shinier and healthier than before after suffering loss. ‘It’s helped my hair to grow back healthily after hair loss