Facial Serum Showdown: 5.07 fl. oz vs 100ppm Retinal for Sensitive Skin & Fine Lines We've always wondered: can a serum be both potent and gentle? Enter MEDITHERAPY Retinal Skin Booster Serum-a sleek 5.07 fl. oz bottle packed with 100ppm retinaldehyde, the golden child of anti-aging ingredients. While some retinol serums feel like a harsh battlefield for sensitive skin, this formula strikes a balance, offering advanced efficacy without the sting. Our testers, including those with delicate complexions and first-time retinol users, found it remarkably soothing, thanks to its calming blend of antioxidants and emollients. The 100ppm concentration targets uneven tone and fine lines with precision, yet the lightweight texture absorbs quickly, leaving no greasy residue. Whether you're chasing a radiant glow or smoothing out early signs of aging, this serum feels like a quiet revolution-powerful, but never overpowering. We're impressed by how it meets the needs of beginners and seasoned skincare enthusiasts alike, delivering visible results without compromising on comfort. A standout for those seeking to level up their routine without the intimidation factor.