Based on the provided reviews, both the HOLY HYSSOP SERUM and the RED SMOOTHIE SERUM by ARENCIA have been praised for their effectiveness in fading dark spots and hyperpigmentation. However, the HOLY HYSSOP SERUM appears to have more reviews specifically mentioning its effectiveness in addressing these concerns. Several reviewers noted that the HOLY HYSSOP SERUM helped fade their acne hyperpigmentation and improved their skin texture. For instance, one reviewer mentioned, "It's helped fade my acne hyperpigmentation... its brightening effects are noticeable! (My complexion looks brighter and clearer)" Review+. Another reviewer highlighted, "After about two weeks, I noticed my dull complexion becoming brighter and more even. It doesn't just provide hydration - it also helps fade dark spots and improve skin texture." Review+. While there are positive reviews for the RED SMOOTHIE SERUM, the specific mention of fading dark spots and hyperpigmentation is less frequent compared to the HOLY HYSSOP SERUM. Therefore, based on the available reviews, the HOLY HYSSOP SERUM seems to be slightly more favored for addressing dark spots and hyperpigmentation.

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