| Active Ingredient | Uses based on scientific evidence | Grade* |
| lavender (lavandula angustifolia miller) | early human studies indicate a potential role for lavender aromatherapy in combination with massage in the short-term treatment of neck pain. more studies are needed. | c |
*Key to grades
A: Strong scientific evidence for this use;
B: Good scientific evidence for this use;
C: Unclear scientific evidence for this use;
D: Fair scientific evidence against this use;
F: Strong scientific evidence against this use.