Cumin oil, which is safe to use in your food, can cause blisters if you put it on your skin.  Citrus oils that are safe in your food may be bad for your skin, especially if you go out into the sun. And the opposite is true, too. Eucalyptus or sage oil may soothe you if you rub it on your skin or breathe it in. But swallowing them could can cause a serious complication, like a seizure.
There is an immense amount of studies exploring the concerns that essential oils are highly concentrated and can irritate the skin when used in undiluted form.[26][27] Therefore, they are normally diluted with a carrier oil for topical application, such as jojoba oil, olive oil, or coconut oil. Phototoxic reactions may occur with citrus peel oils such as lemon or lime.[28] Also, many essential oils have chemical components that are sensitisers (meaning that they will, after a number of uses, cause reactions on the skin, and more so in the rest of the body). Chemical composition of essential oils could be affected by herbicides if the original plants are cultivated versus wild-harvested.[29][30] Some oils can be toxic to some domestic animals, with cats being particularly prone.[31]
Before we talk about where I buy my essential oils, I think it’s important to discuss two terms often used in the buying controversy: “therapeutic grade” and “certified pure therapeutic grade”. It’s important to note that there is no agency that regulates these terms, rather they are made up by the essential oil industry. Don’t let these terms fool you or effect your buying.

When I first started using essential oils for my homemade products, I only owned one oil: lavender. I’ve always been obsessed with the lavender fragrance. Once I learned about the healing properties of lavender for the skin, I decided to add a few drops to my homemade foundation powder. Between the absence of toxins from the store-bought powder and the healing properties of lavender, my acne-prone skin cleared within a few weeks. I was beyond thrilled.

Simple smells such as lavender, chamomile, and rosewater may help keep you calm. You can breathe in or rub diluted versions of these oils on your skin. Scientists think they work by sending chemical messages to parts of the brain that affect mood and emotion. Although these scents alone won’t take all your stress away, the aroma may help you relax.

^ Kuriyama, Hiroko; Watanabe, Satoko; Nakaya, Takaaki; Shigemori, Ichiro; Kita, Masakazu; Yoshida, Noriko; Masaki, Daiki; Tadai, Toshiaki; Ozasa, Kotaro; Fukui, Kenji; Imanishi, Jiro (2005). "Immunological and Psychological Benefits of Aromatherapy Massage". Evidence-Based Complementary and Alternative Medicine. 2 (2): 179–184. doi:10.1093/ecam/neh087. PMC 1142199. PMID 15937558.
According to a review published in Evidence-Based Complementary and Alternative Medicine, “at least 90 essential oils can be identified as being recommended for dermatological use, with at least 1,500 combinations.” What gives these oils their skin benefits is their ability to fight against pathogens that are responsible for dermatological infections. Oils can also help to improve inflammatory skin conditions, like dermatitis, eczema and lupus, improve the general appearance of your skin and even aid wound healing. (16)

There are also quite a few studies that have found essential oils to be helpful for hair growth. One such study, conducted in 2015, evaluated the efficacy of rosemary oil on patients with androgenetic alopecia, or male or female pattern baldness. Patients were randomly assigned to rosemary oil or minoxidil (a medication commonly used for hair loss) for a six-month treatment period. Researchers found that both groups experienced a significant increase in hair count at the six-month endpoint. They also indicated that scalp itching was more frequent in the minoxidil group. (17)

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