Both Mullein and Garlic are hand-harvested at their optimal potency. They are promptly extracted in Certified Organic olive oil while still fresh & succulent or after being carefully shade-dried.Herb Pharm's oils are for topical use only. The herb is extracted into cold-pressed, Certified Organic Olive oil. Herb Pharm assures herb identity via macroscopic and organoleptic analysis, then confirms it through methods such as HPTLC fingerprinting specific to each herb.