ATIKA Journal — The Science of Skin Longevity

What Is Skin Longevity? (And Why It’s Not Anti-Aging)

Skin longevity is the long-term biological health of the skin. This article defines the category and explains how collagen structure, barrier lipids, antioxidant defense, and cellular energy intera...

Dosing Is Not a Detail — It’s the Mechanism

Dosing is what makes an ingredient biologically relevant. This article explains why a “small amount” can be real but still ineffective — like a sip of water that doesn’t hydrate. Learn how dose, du...

GLP-1 Medications, “Ozempic Face,” and Skin Longevity Explained

GLP-1 medications can lead to rapid weight loss, which may affect facial volume, skin structure, and hair cycling. This article explains what “Ozempic face” really means, why these changes occur, a...

Does Collagen Actually Work? What Human Studies Show

Specific oral collagen peptides — most consistently VERISOL® — have been studied in randomized controlled trials. At 2.5 g/day for 8–12 weeks, studies report modest but meaningful improvements in w...

Collagen Decline by Decade: 20s, 30s, 40s, 50s+

A clinical overview of how collagen structure changes across decades -- from the 20s through the 50s+ -- and how UV exposure, hormones, oxidative stress, and foundational skin nutrition influence l...

Antioxidant Supplements for Skin: Do They Actually Work?

Antioxidant supplements reach deeper skin layers through circulation and influence UV-induced redness, oxidative markers, tone, and hydration. This article reviews what controlled human studies act...

Glutathione: What It Does in Every Organ and Why Supplements Often Fall Short

Glutathione is key inside cells, but supplements rarely reach the skin intact. Learn what actually supports antioxidant balance, collagen, and long-term skin health.

Bemotrizinol FDA Proposal: What It Means for U.S. Sunscreen + Skin Longevity

The FDA’s December 2025 proposal to allow bemotrizinol in U.S. sunscreens could expand consumer access to a widely used global UV filter. This guide explains what bemotrizinol is, how it compares t...

Skin Layers and Longevity: A Functional Guide

Skin is not a single surface but a layered biological system. This functional guide explains how the epidermis, dermal–epidermal junction, dermis, and deeper support tissues change over time — and ...

Collagen & Hormones: Estrogen, Cortisol, Thyroid, Androgens

A clinical explanation of how estrogen, cortisol, thyroid hormones, and androgens influence collagen, dermal thickness, and skin structure—and where foundational skin nutrition fits.