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• Vitamin C + Niacinamide – Can cause flushing or irritation in some people, though modern formulations often make them more compatible.
• Retinol + AHAs/BHAs – Too much exfoliation can weaken the skin barrier and cause sensitivity.
• Benzoyl Peroxide + Vitamin C – Benzoyl Peroxide can oxidize Vitamin C, reducing its potency.
• Copper Peptides + Vitamin C – They can destabilize each other, potentially reducing effectiveness.
• Tea Tree Oil + Strong Actives (like Retinol or AHAs) – Can increase dryness and irritation when layered together.
• Essential Oils + Unbuffered Acids – Some essential oils can react negatively with acids, increasing irritation.

"Before trying a new skincare product, it's always a good idea to do a small patch test first. Just apply a tiny amount to a less noticeable area—like your inner wrist—and wait 24-48 hours. This helps make sure your skin gets along with the ingredients and avoids any unexpected irritation. A little precaution goes a long way in keeping your skin happy and healthy!"