Dark circles can be caused by several factors, such as genetics, lack of sleep, allergies, or thinning of the skin, so a single product may not work for everyone. Minimalist Vitamin K+ Retinal 01% Eye Cream needs regular use for a few weeks before results are noticeable, and improvement may be limited if other factors are involved. Getting enough sleep, staying well hydrated, protecting the skin from the sun, and managing allergies may also help improve results. If dark circles persist, please consult a dermatologist for personalised advice and alternative treatment options.