Diffuser: Lemon 4 · Rosemary 3 · Frankincense 2 drops per 100 mL water. Run 30 minutes on, 30 off. At your desk: Lemon 3 · Rosemary 2 · Frankincense 1 on a cotton pad. Two slow breaths. Best for: work-from-home days, study, exam season. Caution: avoid rosemary in pregnancy, epilepsy or high blood pressure.