After five years of development alongside board-certified dermatologist Dr. Dhaval Bhanusali, Stewart launched Elm Biosciences in late 2025. Nearly a year later, the biotech-driven brand’s hero product (the A3O Elemental Serum) has already established itself as a favorite among beauty editors and skincare devotees alike. Elm Biosciences A30 Elemental Serum Shop Now Elm Biosciences $ 135According to editors and reviewers, the texture is just as impressive as the ingredient list. There’s no shortage of celebrity-backed beauty brands on the market these days, but Stewart’s Elm Biosciences feels substance-over-star-power. At $135, it’s certainly a splurge, but if looking even a little more like Martha Stewart is the goal, this serum might be money well spent.