This is determined by the International Fragrance Association (IFRA), which specifies safe upper limits for use across a wide range of product types. Although adhering to these standards is not mandated by law, it is nonetheless common practise in the industry.
We have a record of use levels for many essential oils, and you are welcome to ask us about them or refer to the IFRA conformity certificate issued by the provider of the substance you are using.
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