Are there any vitamins that should not be used together in a skincare routine due to counteractive effects?
Combining certain vitamins without proper spacing or formulation can reduce their effectiveness or even cause irritation. For instance, using vitamin C (an acid) and niacinamide (a base) together without waiting can lead to flushing and reduce their effectiveness due to the pH interaction. However, modern formulations and layering techniques have minimized these issues, making it safer to use them in the same routine with caution.
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