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The Hair Roundup

Comparisons

Head-to-Head Comparisons

When two products are constantly pitted against each other, we put them side by side: formula, evidence, and value, so the right pick for your hair is obvious.

1 comparison Independent analysis
Comparison

Olaplex vs K18: Different Steps, and Which One Your Hair Needs

Olaplex vs K18, researched not tested: one is a pre-shampoo rinse-out, one a leave-in. K18 vs Olaplex on dose, cost per ounce, and the one study.