RoC Skincare is testing its Patented Clinical Retinol in identical female twins, pairing clinical skin measurements with wearable data on sleep, stress and other lifestyle signals. The company says the approach is designed to make it easier to see what the retinol is doing on skin when genetics are held constant.
A natural control
Art Pellegrino, RoC’s chief scientific officer, says identical twins offer an unusually strong study model because they share DNA and much of their early environment. When two people begin with the same genetic blueprint, differences in visible skin aging are more likely to be explained by lifestyle, environment or product use than by genetics alone. The company describes identical twins as close to a natural control.
What the pilot showed
RoC says its pilot twin study was primarily intended to prove that the model could work, not to quantify how much skin aging comes from genes versus daily life. According to Pellegrino, twins in the placebo group had similar or worse signs of aging at the end of the study, while twins in the treatment group had 20% or more improvement in just four weeks. Those are company-reported pilot results; the available details do not include the full study protocol, statistical analysis or independent verification.
The expanded study
RoC is now recruiting 30 pairs of adult female identical twins aged 40 and older who live in the United States. Participants will use a regimen for 12 weeks. The company expects results by mid-2027. Pellegrino says the focused group should yield cleaner data and represents one stage in a longer research program on skin span, or how long skin keeps looking its best.
Wearables enter the protocol
Throughout the study, twins are asked to wear an Oura Ring, a wearable device that tracks health and wellness metrics. RoC plans to capture variations in sleep, stress, heart rate, heart rate variability and temperature trends. The brand’s standard clinical skin measures include expert grading, digital photography, corneometer readings and participant self-assessment.
The combination is intended to let researchers compare each twin with her sister over time. If one twin sleeps poorly or reports more stress, RoC can examine whether her skin responds differently to the regimen. The company also wants to see whether weeks of poor sleep line up with lower hydration readings, or whether the twin with lower stress sees fine lines improve faster. It is additionally interested in whether visible skin improvements make participants feel less stressed.
Pellegrino acknowledges that the study cannot guarantee identical external influences such as sun exposure or diet. To reduce that gap, RoC is recruiting twins with similar levels of environmental damage where possible and tracking sleep and stress closely. The study’s findings are expected to shape how RoC develops products for skin longevity and designs future clinical studies.