RoC Skincare is extending a clinical research program that tests its patented clinical retinol on identical female twins, combining skin measurements with biometric data collected by Oura Rings. The brand is now recruiting for the next phase: 30 pairs of identical twins aged 40 and older living in the United States, each following a 12-week regimen.
A pilot designed to validate the method
The first stage was not intended to quantify how much skin aging comes from genes versus daily life, according to Art Pellegrino, RoC's chief scientific officer. Instead, it asked whether identical twins could offer a more precise way to study what drives visible skin aging. The answer, he said, was yes.
The logic rests on genetics being held constant. Identical twins share DNA and much of their early environment, so differences that appear between them are harder to explain away by inheritance, making lifestyle, environment or product use the likelier cause. Pellegrino described identical twins as about as close as researchers get to a natural control.
In the pilot, twins in the placebo group showed similar or worse signs of aging by the end of the study, while those in the treatment group improved by 20% or more within four weeks, he said.
Wearables alongside clinical grading
Participants wear an Oura Ring, which logs sleep, stress, heart rate, heart rate variability and temperature trends. RoC's standard clinical skin measures run in parallel.
- Enrollment: 30 pairs of identical female twins, aged 40 and older, based in the US.
- Regimen: 12 weeks of the retinol routine.
- Lifestyle tracking: Oura Ring data on sleep and stress across the study period.
- Skin assessment: expert grading, digital photography, corneometer readings and participant self-assessment.
Perfect matching of external factors is impossible, so RoC is recruiting twins with similar levels of environmental damage where possible and monitoring sleep and stress closely. The design allows each twin to be compared with her sister: whether weeks of poor sleep line up with lower hydration readings, for example, or whether the twin under less stress sees fine lines improve faster.
The brand is also examining the reverse relationship, namely whether participants who observe visible improvement in their skin subsequently report feeling less stressed.
Toward skin span
Pellegrino said wearables are opening an opportunity across the industry to factor in how people live when recommending skin care. He positioned the twin study as one stage in a longer research program on extending skin span, or how long skin keeps looking its best, and said the findings will shape both product development for skin longevity and the design of future clinical studies. Results are expected by mid-2027.