Journal
Journal
99 articles — from solving skin concerns to the science of ingredients.
Skin-Concern Solutions10Skin Longevity Series8What “Suits Your Skin” Means5Care Guides by Concern5Skin Structure & Science5The World of Fermented Ingredients5The Complete Peptide Guide5The Complete Vitamin C Guide5Anti-Aging vs Longevity5Skin Longevity Care5How to Choose a Serum5The Truth Behind INCI Labels5Aesthetic Medicine vs Home Care5UV & Photoaging Science5Seasonal & Environmental Skincare5The Evolution of Skin Diagnosis5Understanding the Industry3Choosing Guides2Age & Skin Change1Dullness & Radiance1Skincare Fundamentals1Skin Type & Combination Skin1An Honest Word on Ingredients1Ingredients & Evidence1
Lv.1For Those Whose Skin Stays Dry No Matter What They Apply -- What You're Missing Isn't MoistureLv.1Why Your Skin Gets Dry Even in Summer -- The Science Behind Why Sweating Doesn't Mean HydrationLv.1For Those Who Feel Cream Alone Isn't Enough -- What Needs to Happen Before You "Seal"Lv.1For Those with Sensitive Skin Who Can't Use Anything -- Understanding What "Irritation" Really MeansLv.1The Real Cause of Recurring Breakouts -- Why "Keeping Clean" Isn't EnoughLv.1For Those Who Can't Feel Their Aging Skin Recovering -- The "Foundation" Your Skin NeedsLv.1Uncomfortable with "Anti-Aging"? — The Case for Skin LongevityLv.1For Those Who See No Change from Brightening Products -- The Real Causes of Dull SkinLv.1What's Behind Dull, Tired-Looking Skin — It's Not Just Sleep DeprivationLv.1For Those Who See No Results from Expensive Serums -- Why Price Doesn't Equal Effectiveness
No.0The Lens of Evidence Concentration — The Line Between "Contains" and "Works"2026.07.14No.1Choosing Skin Longevity: The Pledge KAIAN Makes This July2026.07.21No.2Midsummer UV Final Defense — Preparing for Four Layers: UVA, UVB, Visible Light & Near-Infrared2026.07.28No.3The Science of Summer Acne—Sweat, Sebum, Clogged Pores, and the Ecology of C. acnes2026.08.04No.4The Invisible Dryness Under Air Conditioning — The Science of TEWL and Barrier Function2026.08.11No.5The 3-Day Obon Reset ── A Concentrated Rest Protocol for Sun-Tired Skin2026.08.18No.6NEWGrading the Buzzwords of Brightening Skincare2026.08.25No.7NEWThe Season-Change Switch: How the Autonomic Nervous System and the Skin Barrier Move Together2026.09.01
Lv.1The truth about skin concerns — why dark spots, wrinkles, pores, and dryness occurLv.2Dark spot and dullness care — the mechanism of melanin and effective ingredientsLv.3Wrinkle and sagging care — how to protect collagen and elastinLv.4Pore and acne care — the 3 factors of sebum, keratinization, and inflammationLv.5The science of sensitive skin — barrier disruption and microbiome restoration
Lv.1What is skin made of? The 3-layer structure: epidermis, dermis & subcutaneous tissueLv.2How turnover works -- the truth and myths of the 28-day cycleLv.3Stratum corneum barrier function -- the brick and mortar modelLv.4Dermal extracellular matrix -- collagen, elastin & hyaluronic acidLv.5Skin immunity and the nervous system -- is skin a second brain?
Lv.1What's so good about fermented skincare?Lv.2Lactobacillus, yeast, and koji — types and differences of fermented ingredientsLv.3Prebiotics, probiotics, and postbioticsLv.4Skin microbiome and fermented ingredients — how they interactLv.5Formulating fermented cosmetics — from strain selection to quality control
Lv.1What are peptides? Why are they used in skincare?Lv.2Four types of peptides -- signal, neuro, carrier, and enzyme-inhibitingLv.3Peptide effective concentrations and the penetration challengeLv.4The science of multi-peptide formulations -- synergy and antagonismLv.5Next-generation peptides -- synthetic biology and drug delivery frontiers
Lv.1Why is vitamin C good for skin? -- Three key effectsLv.2Types of vitamin C derivatives -- APPS, VC-Ethyl, and ascorbic acid differencesLv.3Vitamin C effective concentrations and stability -- the pH 3.5 barrierLv.4Vitamin C x other ingredients -- synergies and contraindicationsLv.5Cutting-edge vitamin C -- liposomal delivery and next-gen derivatives
Lv.1Is "rejuvenation" really what you need?Lv.2The limits of anti-aging—why "erasing" care doesn’t lastLv.3Most anti-aging ingredients are "symptomatic treatment"—the difference from fundamental careLv.4Why "fighting back" fails—from the perspective of cellular senescence and SASPLv.5Molecular strategy for Skin Longevity—telomeres, NAD+, and autophagy
Lv.1Your skin 5 years from now is shaped by today’s careLv.2"Protect, balance, support"—the 3 steps of Longevity careLv.3Practicing Skin Longevity with ingredients—morning and night routinesLv.4Molecular targets of Longevity care—understanding what you’re caring forLv.5Quantitative evaluation and personalized protocol design for Skin Longevity
Lv.1Are you choosing your serum just by feeling?Lv.2The ingredient list: what the order really tells youLv.3Active ingredients mean nothing if just "included"—concentration mattersLv.4Ingredient quality—same name, different raw material grades, different resultsLv.5Judging formulation quality—choosing from a formulator’s perspective
Lv.1The front of the package is advertising; the back is the truthLv.2The "○○ included" trick—why trace amounts aren’t a lieLv.3Cosmetics vs. quasi-drugs—what "active ingredient" really meansLv.4The dark side of raw material grades—same ingredient name, different qualityLv.5Structural limits of ingredient labeling and new transparency standards
Lv.1What aesthetic medicine can do, and what cosmetics can doLv.2Essential home care during aesthetic medicine "downtime"Lv.3Botox & HA fillers vs peptide care -- understanding the differencesLv.4Retinol formulations vs prescription tretinoin -- the science of concentration and efficacyLv.5Optimal protocol for aesthetic medicine + home care -- a Skin Longevity perspective
Lv.1Your skin changes dramatically with the seasonsLv.2Summer skincare — the triple threat of UV, sweat, and sebumLv.3Winter skincare — protecting your barrier in a 30% humidity worldLv.4Pollen, PM2.5, blue light — environmental stress and skinLv.5Adaptive skincare design — the science behind personalized ampoules
Lv.1The Evolution of Skin Diagnosis — From Subjective Mirrors to the Age of AI VisionLv.1"Recommending What Suits Your Skin" Is Outdated — Introducing Gap-Driven DiagnosisLv.1A Monthly Selfie That Moves Your Skin Toward the Future — The Invention of the Longitudinal ScoreLv.1As Your Skin Changes, So Does Your Care — Adaptive RecommendationLv.1From AI That Sees "Now" to AI That Predicts the "Future" — KAIAN's Next Stage