Essential oils show up seemingly everywhere. They’re in lotions, hair care products, aromatherapy, cleaning supplies and more.

As gifts, they might arrive in little jars with a diffuser device. Essential oils are steam-distilled or cold-pressed extracts of almost any part of a plant such as seeds, flowers, fruit, leaves, stems and roots — so they retain natural smells and flavors. Think lavender or jasmine.

Depending on which oil, the products are touted as helping with sleep, alertness, relaxation and other benefits, but are they always safe? While they’re benign for many users if properly used, some people report allergic reactions or breathing problems — potentially an asthma concern.

“There is no evidence that essential oils can help asthma,” said Melanie Carver with the Asthma and Allergy Foundation of America. “In fact, breathing in the particles released by the oils may actually trigger airway inflammation and asthma symptoms.”

“It is best to talk with your health care provider before trying anything new.”

Consumers also should be mindful that bottled essential oils are highly potent and “50 to 100 times” more concentrated than the oils in the plant itself, a Dec. 10 Washington Post article cited.

Research offers promising results, along with mixed evidence of health benefits for essential oils, said the article, which included comments from Harpreet Gujral, director of integrative medicine at Sibley Memorial Hospital in Washington, D.C.

“The research is quite promising,” Gujral said. She also cited continuing clinical studies striving to measure the degree to which oils can alleviate symptoms of anxiety and nausea, as well as how they affect mood. “The results are mixed but the research is there,” she said. “We just need more.”

About 10 of 100 most common essential oils have been researched “in great depth” in recent decades, the article cited, with evidence such as “the cooling sensation of peppermint oil, the bacteria-killing power of tea tree oil or the calming effect of lavender,” but the results aren’t guaranteed for everyone.

As products distilled from plants, essential oils — like vitamins — aren’t regulated by the Food and Drug Administration.

Sandy Falkner and Peggy Ward of Spokane, Wash., tell people that if you’re new to essential oils, it’s best to start with a small amount applied cautiously. The sisters use essential oils and sell them as distributors for Young Living Essential Oils.

“We always say start low and go slow, meaning you want to start by applying a small amount to the bottom of feet to see if you’ll have a reaction,” Ward said. “Every human body is different.”

If using an essential oil in a diffuser, Ward also suggests that people try a shorter period of time at first to test for any reactions. Ward said she has allergies, including to citrus, along with an almond sensitivity.

“I haven’t found any challenges with using any of the essential oils, although I have a ton of allergies. I can’t eat citrus, but I can consume and use citrus oils without an effect.

“The reason for that is with steam distillation or cold-press distillation that is done in the citrus oil, it removes the protein that most people would have an allergic reaction to.”

She said another consideration is the quality and purity of oils used. Research a company to make sure there aren’t additives.

“If you’re using a lower- grade oil, perfume oil or a floral water, you’re not going to get the effects,” Ward said. “And there’s a good chance they’re going to contain synthetics, pesticides, fertilizers or chemical extenders.”

Pure coconut, grapeseed or virgin olive oil can be used to dilute an essential oil for topical use, she said. These carrier oils have larger molecules than essential oils, Ward added, so a mixture will penetrate skin at a slower rate.

Ward added that peppermint oil is an example of an essential oil that should be used cautiously and diluted with a carrier oil. Young Living says on its website that peppermint’s cooling sensation can be too intense. Also, children and seniors often have more sensitive skin, Ward said.

Falkner said customers largely report benefits from use of essential oils such as for facials and skin care. She turned to essential oils in a search of a chemical-free lifestyle.

Most essential oils are distilled, but consumers should check on labels and research companies to make certain that solvents or chemicals weren’t used in the oil extraction process, Falkner said.

“Learn the company, learn how the oil is distilled, learn how it’s extracted,” Falkner said. “There are many ways you can do it, but the ways that are steam and cold-pressed keep out the chemicals and all the other stuff that can cause breathing problems.”

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