Both topical and neat refer to applying essential oils to the skin.
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Neat means undiluted (straight from the bottle, not mixed with anything else), and is generally recommended only for application on the bottoms of the feet.
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Topical dilution for healthy individuals is 10% (60 drops per 1 ounce of carrier oil). A topical dilution of 25% (150 drops per 1 ounce of carrier oil) may be warranted in cases of severe pain, bad bruising, or serious muscle cramping.
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​For example: 60 drops of an essential oil in 1 full bottle of HBN Grapeseed Carrier Oil (1 ounce) would equal a 10% dilution for topical application.