Evidence Level
Ceramides (Phytoceramides) are bioactive lipids crucial for maintaining skin barrier function and hydration. Research supports their use as oral supplements to address ceramide deficiencies, particularly in aging skin and conditions like atopic dermatitis.
A randomized, double-blind, placebo-controlled trial by Guillou et al. (2011) demonstrated the efficacy of wheat-derived phytoceramides. In a study involving 51 participants, supplementation with 350 mg/day for 12 weeks significantly improved skin hydration on both arms (P < 0.001) and legs (P = 0.012), while also reducing transepidermal water loss.
Japanese studies by Asai & Miyachi (2003) corroborate these findings, showing that rice-derived ceramides can improve skin texture at lower doses. These results align with a review by Tessema et al. (2017), which highlights the potential of plant-derived ceramides in enhancing epidermal barrier function.
The mechanism of action is well-documented: dietary ceramides are absorbed, processed in the liver, and transported to the skin via lipoproteins, where they integrate into stratum corneum lamellar structures. This process is particularly relevant given that ceramide levels decline with age and are often deficient in atopic dermatitis (Imokawa, 2009). These findings provide a strong rationale for the use of phytoceramides as a targeted approach to support skin health.