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[DOI] [PMC free article] [PubMed] [Google Scholar] 2.Olivares O., Mayers J.R., Gouirand V., Torrence M.E., Gicquel T., Borge L., Lac S., Roques J., Lavaut M.-N., Berthezne P
5 Human trials corroborate these findings, as individuals with metabolic syndrome consuming 250500 mg of amla fruit extract twice daily for 12 weeks exhibited reduced lipid peroxidation and increased GSH levels
Irritation and sensitivity Retinol alone can cause: Redness Peeling Dryness Burning sensation Increased sensitivity Adding peptides usually helps: Most peptides are soothing Support skin barrier repair Reduce inflammation When irritation occurs despite peptides: Reduce retinol frequency (every other night instead of nightly) Use lower retinol concentration (0.25% or 0.5% instead of 1%) Apply peptides in morning, retinol at night (not together) Add more moisturizer Take retinol break for few days pH incompatibility concerns The pH issue: Retinol works best at pH 5.5-6 Some peptides work best at different pH ranges Mixing products with very different pH can reduce effectiveness In practice: Modern formulations account for this Short contact time between layers minimizes pH issues Many successful products combine peptides + retinol in same formulation Solution: Don't worry excessively about pH
JCI Insight 2 , e91454 (2017)
