Popularly known for being a culinary herb, rosemary is from the mint family and has been used in traditional medicine for centuries. Rosemary essential oil has a woodsy fragrance and is considered a mainstay in aromatherapy. Research shows that simply inhaling the aroma of rosemary essential oil can lower levels of the stress hormone cortisol in your blood. 

This oil can help support memory and concentration in simple and fresh diffuser blends with bergamot and vetiver or cypress and lemon. While it can help you feel alert, rosemary is also emotionally calming for the body. Pair with lavender tea tree for a more relaxing but invigorating blend in the diffuser.