Cos De BAHA is widely appreciated by the community for its high-concentration active ingredient serums, especially the Tranexamic Acid 10% Serum, which is praised for effectively targeting hyperpigmentation at an affordable price. The brand’s focus on potent, science-backed formulations aimed at problem-solving skincare sets it apart. While generally well-received, some users report mild irritation, indicating it might not be ideal for extremely sensitive skin.