A serum and cream moisturization regimen outperforms separate use in sustaining hydration, reducing TEWL, and balancing surface lipids over an 8-h study.
Alexandra M Maldonado López, Ivan Domicio da Silva Souza
✦ AI-curated · Sources linked
In 30 seconds
This randomized controlled trial compared a facial cleanser control, hyaluronic acid serum, moisturizing cream, and serum followed by cream in 123 volunteers. Hydration, transepidermal water loss (TEWL), and surface sebum were assessed at baseline, 30 minutes, and 8 hours. At 8 hours, only the combined routine maintained higher hydration than the cleanser control; only serum maintained lower TEWL. The routine’s sebum measurements were closest to baseline and lower than those with either product alone, and participants reported greater immediate and lasting hydration with the routine.
Key findings
- At 30 minutes, serum, cream, and the combined routine increased hydration versus cleanser control; at 8 hours, only the routine remained higher.
- TEWL was lower than control at 30 minutes with all three treatments, but at 8 hours only serum remained lower.
- At 8 hours, routine sebum measurements were closest to baseline and lower than measurements with serum or cream alone.
- Participants reported greater immediate and lasting hydration with the routine than with either product individually.
Why it matters
The findings suggest that combining a humectant serum with a moisturizing cream may sustain measured hydration over an 8-hour period better than either product alone. The differing TEWL results show that hydration and water-loss measures did not follow identical patterns, while surface lipid measurements provide an additional barrier-relevant outcome. These short-term results help characterize product-regimen effects but do not establish longer-term skin benefits.
What to keep in mind
Measurements covered only 8 hours after application, so the study does not establish longer-term effects.