The Theorem Advantage:
Driven by Beauty, Backed by Science
We have our own private R&D team, our own lab, and our own manufacturing plant. With over 25 years in manufacturing, we make all Theorem formulas ourselves, in our Chicago-based, family-owned facility. We have first access to the latest clinical studies and ingredients so we are always one step ahead of the pack.

What Makes Us Unique?
Heavily rooted in R&D, you could say our team geeks out about hair care. Each product is hand-crafted to incorporate proven science. Every formula is perfectly pH balanced to promote a healthy root, strand and tip. We’ve reviewed thousands of clinical studies and worked on 10’s of thousands of formulations throughout our careers. Theorem is a culmination of the most promising data of our combined lifetimes.