As little kids playing in the waves of Australia’s Bondi Beach, identical twins Kim and Zoe Roebuck loved soaking up the sun—but all that fun took its toll in the form of itchy skin and eczema. Enter a few magical formulas concocted by their parents, both of whom happened to be doctors. The D.I.Y. blends relied on fresh ingredients like macadamia nut oil to soothe the sisters post-beach-bumming. Years passed, and Kim and Zoe built thriving careers in the media and pharmaceutical industries, but they had always wanted to work together and realized that the simple, powerful recipes treasured by their fam would be an amazing addition to the clean-skincare movement. In 2014, after fine-tuning and expanding upon those original conoctions, the pair launched Dr. Roebuck’s, a brand “built on science, clean ingredients, and living your best life,” says Zoe. Incorporating spring water locally sourced in Tasmania, each product—from an algae-infused mask to a calming rosehip moisturizer—is still crafted with as much love as those very first batches.