Chemistry is the science behind Essential Oils. Each essential oil has a latin name and has significant chemical differences from each other. For example, Spike Lavender (latin name Lavandula Latifolia) is DIFFERENT from Lavender (Lavandula angustifolia). They both contain Linalol, which is anti-infectious and an immune stimulant, BUT Spike Lavender also contains Camphor (which should be avoided during pregnancy) and 1,8 Cineole (which should not be used with kids under 10 years old). Be sure to research your essential oil! You can find the Latin name of the essential oil on your bottle. I make sure I use Lavender (Lavandula angustifolia) in my homemade lotion. Read more at http://aromahead.com/ and http://www.aromaticsinternational.com/products/camphoraceous/spike-lavender.