Butterbur (PA-free leaf extract)

Petasites hybridus

Interstellar grade A

Human trial evidence: Randomized or controlled human data. It opens a pathway on its own.

Appears on 1 blend page, linked below.

Petasin in butterbur leaf blocks leukotrienes, the chemical that swells nasal and bronchial linings in pollen season — without the liver's burden.

Where it appears

One blend page carries this ingredient. Open it and you will find this ingredient in the list.

• Lung Power (Respiratory Capacity)