A freshwater microalga is an unlikely starting point for an eye-care story. Yet Scenedesmus rubescens, a microscopic organism found in freshwater environments, became the subject of a question that reaches far beyond the water: could its extract influence how human skin responds to light? [Campiche et al., 2018]
That biology is part of what made researchers curious. To bring the question closer to skincare, they followed the extract into skin-cell and tissue experiments, measuring how it influenced particular responses to light.
In a 2018 study, researchers tested a Scenedesmus rubescens extract in cultured human fibroblasts and skin samples maintained outside the body. They reported improved viability measurements in UVA-exposed fibroblasts and fewer UVB-damaged “sunburn cells” in skin tissue. In separate experiments without UV exposure, the extract increased type III collagen in skin tissue. A cell-free assay also found inhibition of tyrosinase, an enzyme involved in pigment production. [Campiche et al., 2018]
Oxidative stress adds another part of the picture. In its technical research, dsm-firmenich reports lower levels of reactive oxygen species and oxidatively modified proteins in skin biopsies treated with PEPHA-AGE CB and exposed to controlled blue light. These measurements explore how the tested ingredient affects skin’s response to an experimental stress. [dsm-firmenich technical research]
A 2020 peer-reviewed study moved the pigmentation question into human testing. In a randomized, double-blind, placebo-controlled trial, 33 women with skin phototypes III and IV received repeated blue-light exposure on their inner forearms. A test cream containing 3% of the commercial PEPHA-AGE ingredient reduced visible pigment darkening compared with the placebo cream. That 3% refers to the commercial preparation, not pure dry algal extract. [Campiche et al., 2020]
The exposure matters: the trial used a dedicated lamp delivering four controlled doses of blue light at 450 nm. It did not test everyday phone or computer use. The useful story is how an ingredient performed under defined conditions, without turning an ordinary screen into something to fear. [Campiche et al., 2020]
For Earth & Halo, the interest lies in the connection between oxidative stress, pigmentation response and skin structure. The laboratory experiments and test creams help explain why this ingredient became interesting to formulators. In Apple Of My Eye, PEPHA-AGE CB works as one part of a broader eye and lip contour formula. Daily sunscreen remains a separate step.
Explore Apple Of My Eye Eye & Lip Contour and the science behind its approach to daily contour care.
