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The COSRX AHA 7 Whitehead Power Liquid Toner is a game-changer for Jacquelyn, who loves its effectiveness and gentleness. With a 7% glycolic content, it surpasses other products she has tried with lower percentages. This toner has proven to be a godsend for Jacquelyn's hormonal acne, providing relief during her period. However, she emphasizes the importance of wearing sunscreen religiously while using this product to avoid sunburn. While the instructions suggest using a cotton pad, Jacquelyn prefers using her fingertips for better results. Having already gone through a second bottle, she is completely obsessed with this toner, rating it a perfect 10. Overall, the COSRX AHA 7 Whitehead Power Liquid Toner impresses Jacquelyn with its effectiveness and gentle formula, making it a must-have in her skincare routine.