A Dermatologist’s Guide to Understanding Skincare & Haircare Ingredients

Skincare and haircare products often list dozens of ingredients, many with scientific names that are difficult to understand. But behind every effective formulation is a clear scientific purpose.

At Dr. Su the Integrated Dermatologist brand, we believe that informed choices lead to better skin and hair health. This Ingredient Dictionary is designed to help you understand how different actives work, what concentration levels matter, and how to choose ingredients based on your concern rather than trends.

Instead of blindly following viral ingredients, this guide breaks down each one through a clinical lens, explaining its function, mechanism, safety profile, and where it works best.

Why Understanding Ingredients Matters

Marketing claims can be powerful. But results depend on:

• The right ingredient
• The right concentration
• The right formulation environment
• The right pairing with other actives

For example, a brightening ingredient like Kojic Acid works differently from Niacinamide. Hair growth actives such as Redensyl and Procapil target different biological pathways. Without understanding this, it’s easy to use products that don’t align with your goals.

This dictionary helps bridge that gap.

How to Read an INCI List

INCI (International Nomenclature of Cosmetic Ingredients) names standardize ingredient labeling globally.

Here are a few important things to know:

• Ingredients are typically listed in descending order of concentration.
• Actives usually appear higher in the list if present in meaningful amounts.
• Supporting ingredients (preservatives, stabilizers, humectants) improve formulation performance but may not directly treat concerns.

Understanding INCI names allows you to compare products more intelligently and avoid being misled by highlight marketing ingredients present in very low percentages.

Why Percentage & Formulation Matter

An ingredient’s effectiveness is not just about its presence  it’s about:

• Clinical dosage range
• Stability in formulation
• Delivery system
• Compatibility with other actives

For example:

• Hair growth peptides work best when consistently applied at studied concentrations.
• Brightening ingredients require sunscreen support to maintain results.
• Hydrating molecules vary in molecular weight and penetration depth.

This is why each ingredient page in this dictionary includes typical usage levels and scientific references where available.

Science-Backed, Dermatologist-Reviewed

Each ingredient explanation in this dictionary is written with clinical relevance in mind. Where possible, references are included to provide context for scientific evidence.

This resource is educational and does not replace personalized medical advice. Individual response to ingredients may vary depending on skin type, scalp condition, and overall health.