Member exclusive Q&A: Can I leave essential or fragrance oils out of formulas?

In the February Q&A, Sima asked: I am very sensitive to smell and get migraines. I use Kevin Murphy shampoo as it is the only shampoo that I find that doesn’t give me a headache. But I want to make my own shampoo and conditioners so I would love your advice on essential oils and fragrances…....

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