Skincare Ingredient Compatibility: What You Can & Can't Mix

Skincare ingredient compatibility chart — CanadianGlow

Understanding skincare ingredient compatibility is essential for achieving the best results from your routine. This guide will help you navigate which ingredients work well together and which combinations to avoid.

By following these guidelines, you can create effective AM and PM routines tailored to your skin’s needs.

The skincare active compatibility chart

Vitamin C Retinol / Retinoids Niacinamide AHA BHA Benzoyl Peroxide Hyaluronic Acid Peptides
Vitamin C — ⚠️ ✅ ⚠️ ⚠️ ❌ ✅ ⚠️
Retinol / Retinoids ⚠️ — ✅ ❌ ⚠️ ❌ ✅ ✅
Niacinamide ✅ ✅ — ✅ ✅ ✅ ✅ ✅
AHA (Glycolic/Lactic) ⚠️ ❌ ✅ — ⚠️ ⚠️ ✅ ⚠️
BHA (Salicylic) ⚠️ ⚠️ ✅ ⚠️ — ⚠️ ✅ ⚠️
Benzoyl Peroxide ❌ ❌ ✅ ⚠️ ⚠️ — ✅ ⚠️
Hyaluronic Acid ✅ ✅ ✅ ✅ ✅ ✅ — ✅
Peptides ⚠️ ✅ ✅ ⚠️ ⚠️ ⚠️ ✅ —

✅ Generally fine to layer   ⚠️ Caution / alternate or separate AM&PM   ❌ Best avoided together

How to Read the Chart

The chart categorizes ingredients based on their compatibility. Ingredients that can be layered are marked as compatible, while those that may cause irritation when mixed are labeled as incompatible.

Rules of Thumb

Vitamin C (AM): Best used in the morning for antioxidant protection. Avoid mixing with direct acids.

Retinoids (PM): Use at night for cellular turnover. Avoid combining with other strong actives to minimize irritation.

Niacinamide: Generally compatible with most ingredients, but avoid pairing with Vitamin C for optimal results.

AHA/BHA: Effective for exfoliation. Avoid using with retinoids to reduce potential irritation.

Benzoyl Peroxide: A popular acne-fighting ingredient. Avoid mixing with retinoids to prevent irritation.

Building an AM vs PM Routine

In the morning, focus on hydration and protection with Vitamin C and moisturizers. In the evening, prioritize repair and treatment with retinoids and exfoliants.

How to Introduce a New Active

Start with one new active at a time. Conduct a patch test on a small area to check for any adverse reactions before incorporating it fully into your routine.

Shop actives by ingredient at CanadianGlow

Frequently asked questions

Can I use Vitamin C and Niacinamide together?

Yes, they can be used together, but it's best to apply them at different times.

Is it safe to layer AHA and BHA?

Yes, they can be layered, but be cautious of potential irritation.

How often should I use Retinoids?

Start with 2-3 times a week and gradually increase as tolerated.

What is the best way to patch test a new product?

Apply a small amount on a discreet area and wait 24 hours to check for reactions.

Can I use multiple exfoliants in one routine?

It's best to choose one exfoliant per routine to avoid irritation.

More free guides from CanadianGlow

Product information is provided for general reference only. Always read and follow the directions, warnings and ingredient list on the product packaging. For any over-the-counter treatment product, consult a pharmacist or healthcare professional if you are unsure.