Used in baking and cooking, this essential oil scent is fragrant and pungent...but the reason it's found in skin care products is because it's a very natural preservative - as a matter of fact, we use it in the cold process soap we make for sensitive skin...!  Rosemary can stimulate your system and lower the stress hormone that plagues us all, cortisol - so diffusing into the air helps you benefit in many ways, not to mention having your home smell like a forest!
 
Botanical Name:  Rosmarinus Officinalis