The Claim
Topical application of retinol and retinoic acid is associated with a sustained downregulation of glycan-degrading enzymes in the stratum corneum at 3 months, with retinol demonstrating a broader effect than retinoic acid.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Topical retinol and retinoic acid reduce the activity of enzymes that break down glycans in the outer layer of skin after three months of use, with retinol having a stronger effect than retinoic acid.
See the scientific wording
Topical retinol and retinoic acid are associated with a sustained downregulation of glycan-degrading enzymes in the stratum corneum, particularly at 3 months, with retinol showing a broader effect than retinoic acid, suggesting a potential role in preserving glycosaminoglycan structures in aged skin.
When retinol or retinoic acid is applied to the skin, they enter skin cells and trigger a cascade that turns off enzymes that break down sugar chains in the outer skin layer. This allows those sugar chains to stay intact, which helps the skin hold moisture and maintain its structure over time. Retinol turns off more of these enzymes than retinoic acid, making its effect broader.
What the research says
1 studyThis study found that applying retinol and retinoic acid to the skin reduces the activity of enzymes that break down important sugar molecules in the outer skin layer, especially in the first few months. This helps keep the skin’s structure and moisture intact, which is why these ingredients are used in anti-aging products.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.