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As of May 12, 2026, Brightening Boost is cheapest at COSRX Official for $42.50.
The Brightening Boost is your intensive, expert-engineered kit to achieve a visibly brightened, glowing, and smooth complexion.
This powerful bundle pairs two best-selling formulas for maximum brightening impact with zero irritation.
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No price drops in the last 90 days. The all-time low was $42.50 at COSRX Official on February 24, 2026.
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