This site's own mechanism sequence lists this specific second step — worth understanding it on its own, distinct from the structural step before it.
This site describes it directly: Vitamin B12 and Folate are both positioned to support the replication and renewal of skin cells, aimed at a more even, rejuvenated complexion.
Worth noting this is the only step in the site's six-step sequence tied to two ingredients rather than one — B12 and Folate together, distinct from the single-ingredient steps around it.