The d'reena Journal

Skin science, treatments, and what actually works.

Notes from our therapists on the ingredients and treatments behind every facial — what they do, how they work, and why we choose them for your skin.

Skin Care Basics

Testing a New Skincare Product: A Small-Area Trial Is Not Medical Patch Testing

A small-area trial can reveal an obvious reaction before full-face use, but it cannot diagnose an allergy or guarantee that every future use will suit you.

Sun Care

Your Scalp Is Skin Too: Sun Protection Beyond the Hairline

Skin Science

Does Your Skin Know What Time It Is? Circadian Rhythms Explained

Skin shows daily biological rhythms, but the evidence does not support a rigid hourly skincare timetable or a complicated clock-based routine.

Skin Care Basics

Your Face Towel and Pillowcase: When Clean Tools Matter More Than More Actives

Skin Myths

Does Facial Steam Open Your Pores? What Heat Actually Changes

Steam does not open pores like doors. Warmth can change surface feel and soften residue, but more heat is not automatically better for skin.

Ingredients

Niacinamide, NAD+ and Skin: Where the Evidence Stops

Skin Care Basics

Why Skincare Pills Under Sunscreen—and What to Change First

Those little rolls are usually product layers gathering on the surface—not proof that your skin is peeling. Troubleshoot without sacrificing sunscreen coverage.

Skin Myths

Can Face Massage Really ‘Drain Toxins’? A Better Way to Describe It

Skin Care Basics

Non-Comedogenic: Helpful Label, Not a No-Breakout Guarantee

“Non-comedogenic” is a useful shopping clue, but it cannot guarantee that every formula will suit every person or prevent every breakout.