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Start here. Everything you need before you buy anything.
Quick answer
Skincare 101 is the foundation library of the Elelaf Journal. It explains how skin actually works — barrier, microbiome, sebum, cell turnover — in plain English, then translates that into beginner routines you can build in five minutes. Every piece is dermatologist-reviewed and free of marketing hype.
How skin actually works at a layer level.
Identify your real type — and how it shifts with age.
The acid mantle and why it's non-negotiable.
What lives on your skin and why it matters.
AM and PM application order, decoded.
How to read an ingredient list without falling for marketing.
The minimum viable routines that actually work.
Plain-English definitions for every term you'll encounter.
Quick myth-busts beginners run into early.
From gua sha to LED — what's worth using.
I had a conversation last spring with a dermatology resident who told me, with conviction, that she had a “Fitzpatrick III skin…
A reader sent me a photo of her cheek next to a moisturiser bottle and asked whether she should switch brands. Her…
A reader wrote in last month asking why her skin had gotten worse since she switched to a “dry skin” routine. She…
TL;DR: The eight-glasses-a-day rule has no clinical origin; the standard tracing is to a 1945 NRC recommendation that was misquoted for sixty…
TL;DR: The word ‘clean’ on a cosmetic bottle has no legal meaning in the United States. The FDA does not define it,…
TL;DR: The INCI list is ordered by concentration above 1%, then in any order below. Five ingredients almost always live below the…
TL;DR: Five reasonably designed RCTs on oral collagen peptides, including Proksch 2014 and Bolke 2019, show small but measurable improvements in skin…
TL;DR: The ‘never mix acids and retinoids’ rule originated from skin-cycling logic and from concern that the low pH needed for AHA…
TL;DR: The skin runs on a 24-hour clock. Cell proliferation peaks at midnight to 4am. Sebum output peaks at noon. TEWL spikes…
TL;DR: Real purging is a narrow phenomenon limited to cell-turnover actives, lasts six to eight weeks, and only appears in areas you…
Most people start buying skincare before they understand what their skin actually needs. That's why so many routines fail: the wrong order, the wrong actives, the wrong assumption that more products equals better skin. Skincare 101 fixes that.
This category is the entry point for everyone — whether you're 19 and just figured out moisturizer is non-negotiable, or 38 and rebuilding your routine from scratch after a barrier flare. The articles here give you the working knowledge that turns skincare from a confusing aisle into a small set of decisions you can make confidently.
Long-form, plain-English explainers covering skin anatomy and biology, the four common skin types and how to identify yours, the science of the skin barrier and pH, an introduction to the skin microbiome (the field that's reshaping skincare in 2026), the actual order to apply skincare products, and how to read an INCI label without falling for marketing.
Skincare is built on a small handful of truths. Your barrier is non-negotiable. Sunscreen prevents more aging than every anti-aging product combined. Cell turnover slows with age, and that's the lever almost every active ingredient pulls on. Once you understand these, the difference between a product that helps and a product that just costs money becomes obvious.
True beginners, returners after a long break, and anyone who feels they've been guessing at skincare for years. If you've ever wondered which order things go in, or whether your skin type actually changed when you turned 30, you're in the right place.