When it comes to skincare, some ingredient combinations can lead to irritation, dryness, or even cancel out each others effects. Here are some skincare ingredients that should not be mixed:

• Retinol and benzoyl peroxide: These two ingredients can cause excessive dryness, redness, sensitivity, or a rash when used together.

• AHA/BHA and niacinamide: When combined, these ingredients can potentially lessen the effectiveness of products or cause redness.

• Vitamin C and AHA/BHA: Mixing these two ingredients can destabilize vitamin C and lead to temporary staining or irritation.

• Vitamin C and glycolic acid: These two ingredients can cause irritation and redness when used together.

• Vitamin C and salicylic acid: This combination can cause dryness, redness, and irritation.

• Vitamin C and benzoyl peroxide: These two ingredients can destabilize vitamin C and lead to temporary staining or irritation.

• Retinol and vitamin C: These two ingredients can destabilize each other and cause irritation.

• Retinol and salicylic acid: Using these two ingredients together can cause excessive dryness, redness, sensitivity, or a rash.

To avoid these issues, its best to use these ingredients separately or on different days. For example, use vitamin C in the morning and retinol in the evening. Its also important to patch test new products and introduce them gradually into your routine to avoid any adverse reactions.