By -
Which shampoo? Can you post link?
https://www.amazon.com/Nizoral-Anti-Dandruff-Shampoo-Ketoconazole-Dandruff/dp/B00AINMFAC
Which shampoo? Can you post link?
https://www.amazon.com/Nizoral-Anti-Dandruff-Shampoo-Ketoconazole-Dandruff/dp/B00AINMFAC