Ingredient guideTranexamic acidEvidence: StrongBrightening active with good data on stubborn dark patches and PIH — pairs well with niacinamide.Dark spots (PIH)Dullnessaka: txaProducts with tranexamic acid (5)Anua — Niacinamide 10% + TXA 4% Dark Spot Serum$22 · KR #3 · ★4.5Mary&May — Tranexamic Acid + Glutathione Serum$19 · KR #19 · ★4.5Anua — Niacinamide 5% TXA Brightening Pad$22 · ★4.6COSRX — Alpha-Arbutin 2 Discoloration Care Serum$25 · ★4.4Haruharu Wonder — Centella 4% TXA Gel Serum$25 · ★4.5