Beauty questions, answered with evidence
Why it happens.
What actually helps.
Clear answers to the beauty questions people search every day, from sunscreen that pills to nails that peel. Each guide explains the cause, what studies and regulators say, and what to try first.
Researched and edited by H. Lee. See how we grade evidence.
Six topics, one standard of evidence
Sunscreen science
How sunscreen filters work, why US and Korean labels differ, how much to apply and why some formulas pill, explained with FDA rules and studies.
Explore the topic →Ingredients & layering
What common skincare actives do, which ones can share a routine and how barrier creams work, based on controlled studies and regulator reviews.
Explore the topic →Acne marks & texture
Why acne marks turn red or brown, how exfoliating acids smooth texture and clogged pores, and which fixes have the strongest human evidence.
Explore the topic →Hair & scalp science
Why hair feels waxy or limp, how porosity and silicones interact, and what bond-repair and scalp products do, explained in plain cosmetic terms.
Explore the topic →Nails & makeup wear
Why nails peel in layers, how safe UV nail lamps are and why foundation separates on the nose, answered with published studies and practical fixes.
Explore the topic →K-beauty decoded
Korean skincare products, routines and regulation explained for US shoppers: formulas, ingredient evidence, price per mL and who each one suits.
Explore the topic →Latest articles
Search all 37 articles →
Does Centella Asiatica Help Sensitive Skin?
Ceramides vs Hyaluronic Acid: What Does Your Skin Need?
Why Does Moisturizer Sting? Causes and What to Change
Is Spicule Skincare Safe? What the Studies Show
Can Hyaluronic Acid Dry Out Your Skin?
Closed Comedones vs Milia: How to Tell the Bumps Apart
Do You Need Sunscreen in the Winter? When It Matters
How to Remove Halloween Makeup From Your Face
Is Dry Shampoo Bad for Your Scalp? What the Evidence Shows
Is Hair Oiling Scientifically Proven? What Studies Show
TPO Gel Polish Ban: What It Means for US Manicures
Why Does My Gel Manicure Lift After a Week?
Why Is My Hair So Staticky? Causes and Fixes That Work
Are Silicones Bad for Low Porosity Hair?
Are UV Nail Lamps Safe? What the Study Found
How Much Sunscreen Should You Put on Your Face?
Does Niacinamide Cause Purging? Purge vs Breakout Guide
Can You Use Niacinamide With Azelaic Acid?
PIE vs PIH: How to Tell Red and Brown Acne Marks Apart
Sebaceous Filaments vs Blackheads: How to Tell Them Apart
SPF 30 vs 50 for Face: Which One Do You Need?
Why Is My Vitamin C Serum Turning Orange?
Why Are My Nails Peeling in Layers?
What Is PDRN in Skincare? Salmon DNA, Explained
Why Does My Foundation Separate on My Nose?
Why Does My Hair Feel Waxy After Washing?
Why Does My Sunscreen Pill? Causes and Fixes
Why Aren't Korean Sunscreens FDA Approved?
Round Lab Birch Sunscreen: Korean SPF 50+ vs US SPF 45
Anua vs Manyo Cleansing Oil: Which Should You Choose?
Torriden vs Anua PDRN Serum: Which Should You Choose?
COSRX BHA Blackhead Power Liquid: Formula and Who It Suits
Anua PDRN Capsule 100 Serum: Formula, Evidence, Who It Suits
COSRX Snail 92 Cream: Formula, Evidence and Who It Suits
SKIN1004 Centella Ampoule: Formula and Who It Suits
AESTURA Atobarrier 365 Cream: Formula and Who It Suits
