Christophe Robin makes a hair serum that can turn crunchy, dehydrated hair silky with regular use — but a bottle normally isn’t cheap. As a result, Kathleen Hou, former beauty director at the Cut, uses just a few drops at a time. That’s all it takes to make her hair bouncy and looking as if “it meets its hydration goals on the daily.” The creamy serum’s key ingredient is prickly-pear oil, which is omega rich and known for having double the fatty acid and proteins of argan oil. Today, it’s 60 percent off, down from $54 to just $22. As Hou says, “The bottle is small, but a little bit goes a long way.”
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