Woodsy and medicinal, Dr. Bronner's Tea Tree Pure-Castile Liquid Soap contains pure tea tree oil — good for acne-prone skin and dandruff! Dr. Bronner's soap is concentrated, biodegradable, versatile and effective.Made with organic and certified fair trade ingredients. Packaged in a 100% post-consumer recycled bottle. All-One! Dilute! Dilute! OK! That said, these Pure-Castile Liquid Soap dilutions should get you started. You'll notice that for some applications, we recommend pre-diluting the soap — which usually involved combining the soap with water in a separate container. For other applications, the soap is diluted directly by the water in the shower or faucet. It's a matter of personal preference.Keep in mind that if you pre-dilute, you are also diluting the preservative, so the shelf life will decrease. Use the pre-diluted mixture within a couple weeks or mix up in smaller batches. And yes, there are 18+ uses here!