Skincare Ingredient Guide: What Works and Why

Understanding ingredients helps you build effective routines. This guide covers the most common and effective skincare ingredients and how to use them.

Hydrators

Hyaluronic Acid

• Holds 1000x weight in water
• Use on damp skin, AM/PM
• Suits all skin types

Glycerin

• Humectant, very common
• Found in most moisturizers
• Gentle and effective

Barrier Support

Ceramides

• Replenish skin's natural lipids
• Use in moisturizers, AM/PM
• Essential for dry/sensitive skin

Niacinamide

• Multi-tasker: oil, tone, barrier
• Use AM/PM, 2-5% concentration
• Well-tolerated by most

Antioxidants

Vitamin C

• Brightening, protection
• Use AM, before moisturizer
• Start with stable forms

Vitamin E

• Antioxidant, moisturizing
• Often paired with Vitamin C
• Use AM/PM

Exfoliants

Salicylic Acid (BHA)

• Oil-soluble, penetrates pores
• Use PM, 1-3x weekly
• Best for oily/acne skin

Glycolic Acid (AHA)

• Surface exfoliation
• Use PM, 1-2x weekly
• Best for texture, dullness

Anti-Aging

Retinol

• Cell turnover, collagen
• Use PM only, start slow
• Always with sunscreen

Peptides

• Signal collagen production
• Use AM/PM
• Gentle, well-tolerated

Soothing

Aloe Vera

• Calming, hydrating
• Use as needed
• Great for irritation

Oat Extract

• Soothes sensitive skin
• Use in cleansers, moisturizers
• Gentle for all types

Ingredients to Be Cautious With

• High concentrations of acids
• Alcohol denat (in leave-on)
• Strong fragrances
• Too much protein (hair)
• Unverified "miracle" claims

How to Combine

• AM: Vit C → Moisturizer → SPF
• PM: Retinol or AHA → Moisturizer
• Hydrators anytime
• Don't mix all actives at once
• Introduce one at a time

Reading Labels

• Ingredients listed by concentration
• First 5 = main components
• INCI names (Latin)
• Position indicates amount
• Research unfamiliar ingredients

This guide is a starting point. Everyone's skin is different—patch test, introduce slowly, and adjust based on your response.