The Ordinary Glycolic Acid 7% Toning Solution is a highly-effective exfoliating toner that claims to improve skin texture and radiance. Customers have reported that it is a great solution for hyperpigmentation, and that it doesn't dry out the skin or have a strong odor. The product is also said to be working quickly, with some seeing results in just 4 days. Additionally, some customers have used it on their underarms and seen great results.