Rosemary

The scalp botanical that earned its reputation before marketing found it.

Also known as: Rosmarinus officinalis · Rosemary leaf extract

What it is

An extract of rosemary leaf, rich in rosmarinic acid and camphor-type aromatics.

Why it's in the formula

It is a scalp ingredient: astringent, invigorating, and antioxidant, which is why it has survived centuries of use for hair without needing a rebrand.

Where it comes from

Steam-distilled and solvent-free leaf extract, used at a level you can smell faintly and not one that stings.

What to know

Avoid concentrated essential oil undiluted on skin. Formulated levels are gentle.