Published by Paul Thompson |
Fact-checked against peer-reviewed sources | Updated March 2026
OUTSIDE BEAUTY

# The Science of Beautiful Hair, Skin & Nails

Master the science of skincare actives, build an effective hair care routine, and strengthen your nails with proven treatments and techniques.

## Skin Care

From powerful actives like retinoids and vitamin C to complete AM/PM routines - everything you need for radiant, healthy skin.

### The Complete Retinoid Guide: From Retinol to Tretinoin

Retinoids are the gold standard of anti-aging. Learn about different strengths, how to introduce them safely, and managing side effects.

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### Vitamin C Serums: Stability, Percentages & Application

Not all vitamin C is created equal. Understand L-ascorbic acid stability, optimal percentages, and how to layer for maximum brightening.

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### Sunscreen: The #1 Anti-Aging Product You Need Daily

90% of visible aging comes from sun exposure. Master SPF science, chemical vs mineral filters, and proper reapplication techniques.

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### Niacinamide: The Multi-Tasking Skincare Hero

Pore-minimizing, barrier-strengthening, and brightening - discover why niacinamide works for almost every skin type and concern.

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### Building Your Perfect AM & PM Skincare Routine

Order matters in skincare. Learn the correct sequence for layering products, what to use morning vs night, and how to avoid conflicts.

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## Hair Care

Healthy hair starts at the scalp. Learn the science of hair growth, damage repair, and building a routine for your specific hair type.

### Scalp Health: The Foundation of Beautiful Hair

Your scalp is skin too. Learn how to balance oil production, address dandruff, and create the optimal environment for hair growth.

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### Hair Damage Repair: Protein, Moisture & Bond Treatments

Heat styling, color, and environmental damage take their toll. Understand the science of hair repair and which treatments actually work.

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### Maximizing Hair Growth: Topical Treatments That Work

From minoxidil to rosemary oil, peptides to caffeine - examine the evidence for popular hair growth treatments and how to use them.

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### Hair Care by Type: Fine, Thick, Curly & Coily Guides

Different hair textures need different approaches. Find your specific hair type and build a customized care routine that works.

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## Nail Care

Strong, healthy nails are both beautiful and a sign of good health. Learn proper care techniques and strengthening treatments.

### Nail Strengthening: Treatments for Brittle, Weak Nails

From keratin treatments to nail hardeners, discover which strengthening products actually work and how to use them correctly.

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### Cuticle & Nail Bed Care: The Complete Guide

Healthy cuticles protect nail growth. Learn proper cuticle care techniques, the best oils, and when to push vs leave them alone.

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### What Your Nails Reveal: Signs of Deficiency & Health

Ridges, discoloration, and brittleness can signal nutritional deficiencies or health issues. Learn to read what your nails are telling you.

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## Explore Inside Beauty

Great topical care works best with internal health. Discover how nutrition, gut health, and supplements enhance your results.

Inside Beauty Guide