Peptides for Skin Tightening: What the Research Actually Supports
Peptides signal collagen and elastin synthesis — but the tightening effect is modest, cumulative, and varies by peptide. Here is what works, what doesn't.
Explainers
Plain-English answers to “what is” and “what does” questions in skincare — research-grounded and free of marketing fluff.
What Does Tranexamic Acid Do for Skin? The Brightener Dermatologists Reach For
Tranexamic acid is a synthetic amino acid that targets stubborn pigmentation — melasma, dark spots, post-acne marks — without bleaching. Here is what it does.
What Is Polyglutamic Acid? The Hyaluronic Acid Upgrade, Explained
Polyglutamic acid (PGA) is a large peptide that holds up to 5,000 times its weight in water — more than hyaluronic acid. Here is what it does and how to use it.
What Is Ectoin? The Extremophile Molecule, Explained
Ectoin is a small osmolyte from extremophile bacteria. Here's the plain-English explanation of what it does, how it works, and when it earns its place.
What Does Witch Hazel Do for Skin? The Honest Answer
Witch hazel is an astringent botanical with a long traditional-medicine history. Here's what the published research supports — and where the marketing oversells.