In my experience, combining the three products from The Ordinary—Glycolic Acid, AHA/BHA Peeling Solution, and Retinal—has truly transformed my skin's appearance, especially when dealing with stubborn dark spots. Glycolic Acid is a gentle yet powerful exfoliant that helps to remove dead skin cells and brighten the complexion. I usually use it in the evening after cleansing, but it’s important to follow up with a moisturizer and always apply sunscreen the next day to protect your skin from UV damage. The AHA/BHA Peeling Solution works as a deeper exfoliant by combining alpha and beta hydroxy acids. Used once or twice a week, it effectively clears pores and enhances skin texture. When I first started using the peel, I felt a slight tingling sensation, which is normal, but it’s crucial not to leave it on longer than recommended to avoid irritation. Retinal, a form of retinoid, has been the game-changer for targeting dark spots and promoting skin cell turnover. Unlike retinol, retinal works faster and delivers visible results without as much irritation, at least for my skin type. I apply a small amount in the evening and always ensure to use sunscreen during the day, as retinal can increase sensitivity to sunlight. A consistent routine with these three products, paired with diligent sun protection, has noticeably brightened my skin and faded discolorations over several weeks. Sunscreen is absolutely essential when using exfoliants and retinoids to prevent new dark spots and protect the skin barrier. Remember to introduce these products gradually and monitor how your skin reacts, as overuse can lead to dryness or sensitivity. Overall, The Ordinary’s 'big 3' has been an affordable and effective solution in my skincare journey against dark spots, helping me achieve a clearer, more radiant complexion.