Scientific laws are considered established and universally applicable (to certain class of things or phenomenon under appropriate conditions) but not necessarily definitive. Also called laws of science.
3. Eucalyptus Oil â there are a few different types. In the absence of R.C. oil, grab any kind of eucalyptus that you have and diffuse for congestion relief. 4. Thieves Oil â I donât even know where to start with Thieves oil because it helps with just about everything.
Essential Oils For Concentration*. 1  Rosemary Essential Oil â Helpful when added to an atomizing diffuser. 2  Lavender Essential Oil â An energy balancer. 3  Eucalyptus globulus Essential Oil â Extracted from twigs and leaves of the evergreen Eucalyptus trees.  Peppermint Essential Oil â Made from the perennial herb.