ATIKA Journal — The Science of Skin Longevity

What Is Collagen? A Plain-Language Guide for Skin

A clear, evidence-based explanation of what collagen is, where it sits in the skin, how its structure changes with age and UV exposure, and why type I and III collagen matter most for visible firmn...

The Four Layers of Skin Nutrition: Structure, Lipids, Antioxidants, Cofactors

At a Glance Skin health is shaped by four interacting layers: structure (collagen and elastin), lipids (barrier), antioxidant systems, and micronutrient cofactors. Each layer depends on specifi...

How Long Do Skin Supplements Take to Work? (By Category)

Skin supplements don’t work instantly, and they don’t all follow the same timeline. This guide explains how long collagen, antioxidants, ceramides, and other skin supplements typically take to work.

Composite segmented face showing different skin tones, textures, and aging patterns to illustrate how oxidative stress affects collagen, tone, and barrier lipids beneath the surface.

The Antioxidant System in Skin (Why One Ingredient Isn’t Enough)

A simple guide to how oxidative stress forms in skin, how your internal antioxidant network works, and how factors like pollution, light, and daily habits shape long-term skin longevity. This page ...

Close-up cropped images of a woman’s lower face under warm light, showing skin texture and tone with soft shadows.

advanced skin nutrition

How Do Internal Antioxidants Protect Your Skin From Oxidative Stress?

Oxidative stress begins damaging collagen and barrier lipids long before visible aging appears. This article explains how internal antioxidant systems complement topical care to support deeper skin...

advanced skin nutrition

How Does Pollution Cause Oxidative Stress — and What Helps Your Skin?

Pollution and sunlight create free radicals that add to daily oxidative stress in the skin. This article explains how oxidative stress affects collagen, barrier lipids, and cellular energy — and ho...

Close-up of facial skin showing natural texture, pores, and pigmentation.

advanced skin nutrition

Blue Light, Digital Stress, and Your Skin: What We Know So Far

Blue light from screens isn’t as strong as UV, but research shows it can contribute to oxidative stress, pigmentation changes, and texture shifts over time. This article explains what HEV light act...

Mixed berries—raspberries, strawberries, blackberries, red currants, gooseberries, and blackcurrants—showing the natural sources of polyphenols used in nutritional dermatology.

advanced skin nutrition

Polyphenols for Skin: Human Data on Tone, Redness & Photobiology

Polyphenols support how the skin responds to light, redness, and everyday oxidative stress. Human studies of green-tea catechins, grape-seed OPCs, citrus polyphenols, and maqui anthocyanins show ch...

advanced skin nutrition

Topical vs Oral Vitamin C for Skin: What Actually Works?

A technical comparison of oral and topical vitamin C — how each reaches the skin, the layers they influence, the mechanisms they support, and the limitations of both routes. Explains why combining ...

A person sitting in shallow water, resting their arms on their knee while looking toward the camera.

advanced skin nutrition

How Long Do Antioxidants Take to Work for Skin? Realistic Timelines

Internal antioxidants don’t produce overnight changes. Human trials show distinct timelines: carotenoids and antioxidants rise within weeks, collagen and barrier changes emerge over 8–12 weeks, and...