Arnica basically belongs to a rhizomatous perennial herb that also belongs to the daisies and sunflower family. The arnica oil is an extract of the arnica plant and contains medicinal properties to cure muscle pain and strains. It grows in the mountain regions of Mexico and in the American southwest. Arnica oil helps soothe the discomfort of minor physical injuries, ease muscles, support the body’s natural healing processes, and restore a sense of health and strength. The herbal properties of Arnica oil for pain, bruises, and strains and it helps with a range of health conditions. It is also very helpful in relieving pain associated with arthritis and muscle soreness. Arnica oil proves to be a “valid alternative” to anti-inflammatory medications geared at curing physical pain, swelling, and bruising. Applying Arnica oil for muscle pain has proven especially beneficial to those with osteoarthritis by relieving pain and stiffness. The arnica oil needs to be used properly to achieve the best results. Although arnica may seem like a heal-all for pain, it's not to be treated as medication to treat anything successfully. It is also highly toxic in nature if ingested, so keep it away from pets and children.