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Castile Soap (at least Dr. Bronner's) is concentrated. If you are using it on your skin or hair it is wise to dilute it up to 50% (half water, half soap). Otherwise it can be overly drying or too harsh on your skin and hair. The Dr. Bronner's website for dilutions also instructs this. I've use it both ways and I have very dry skin and eczema. Diluting the soap makes my skin and hair much happier