How much leave-in mask should you use?
A handy dosage guide for every hair type, density, and length. Read More
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Community CALL! Join the #ColdRinseChallenge

Show your support for Breast Cancer Awareness Month. Read More
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Learn how Black Voters Matter is empowering Black communities to fight back against voter suppression. Read More
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Less is more: Simplify your routine with repair products that work

Thanks to the power of biotech, this K18-coded protocol will maximize your time + results. Read More
/ featured, products + routines

How much leave-in mask should you use?

A handy dosage guide for every hair type, density, and length. Read More
/ hair science

What is clarifying shampoo?

Hint: It tackles product buildup + boosts the efficacy of other products. Read More
contributors
Biochemist
Karl Schmieder

Karl is a biochemist + the CEO of MessagingLab, a company that works with other Scientists to help them tell their...

Scientist
Heleen Kibbelaar

Heleen holds a bachelor's and master's degree in (physical) chemistry from the University of Amsterdam and Utrecht University in the Netherlands....

Colorist
Aura Friedman

You name ‘em, Aura has colored their hair. From celebrities like Lady Gaga, magazines like Teen Vogue, and the...

Salon Owner
Christine Thompson

As a professional colorist at Spoke & Weal in Los Angeles, Christine specializes in corrective color, color change, and working...

Colorist
Linh Phan

Linh Phan, or as his loyal following calls him, BESCENE is an international educator, salon owner + CEO. Sharing his trend-spotting...

Scientist
Esther Olu

Esther Olu is an R&D formulation scientist, esthetician, educator, science communicator who is a passionate advocate for dispelling misinformation within the...