✔ 100% bio-based formula (except water) ✔ Independently lab tested & USDA certified bio based Now 100% bio-based! Our famously gentle, award-winning diaper rash ointment is as good as you can get. It's free of common allergens and harsh chemicals, so it’s perfect for soothing sensitive, irritated skin. We removed the water from the formula which allowed us to go preservative-free as all preservatives can be irritating to already sensitive skin. Vitamin-grade zinc oxide treats and prevents diaper rash while purified lanolin leaves a moisture barrier on the skin. Added coconut oil and licorice help soothe sore bottoms. Cloth-diaper safe. Our Diaper ointments are USDA Certified 100% Bio-Based (excluding zinc oxide), meaning they are made from plant-based ingredients and one ingredient from sheep's wool (ultra-purified lanolin).