Are essential oils safe?

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With all of the controversy surrounding MLM companies that sell essential oils, I am starting to question how effective and safe they actually are.

There is not a ton of information that is science and fact based to support a lot of the claims, and the main reason I choose to diffuse them is I simply prefer the smell over traditional candles or scentsy. I don’t believe the crazy claims that they have healing powers. But now I’m getting worried they might actually be dangerous.

Does anyone have any info about the safety of diffusing essential oils, or if they should just be avoided?