A Complete Guide to the Best Olaplex Products — Including Those on Sale For Prime Day

Olaplex No. 9 Bond Protector Nourishing Hair Serum ($24, originally $30)

Unlike other Olaplex hair products, this serum is designed to be used on the daily as a protectant for everything from pollution to heat damage. Per the brand's recommendation, you can use the product on wash days (and any days in between) to ensure your hair is coated in an extra layer of protection. Over time, the formula is said to help hair grow back stronger, retain its natural bounce, and boast a more nourished shine.