i have no idea... i just use this every 4 days
https://www.amazon.com/Nizoral-Anti-Dandruff-Shampoo-Ketoconazole-Dandruff/dp/B00AINMFAC
https://www.amazon.com/Maui-Moisture-Hibiscus-Shampoo-Ounce/dp/B07GQ5S5WX/ref=sr\_1\_11?keywords=No+Sulfate+Shampoo&qid=1671834104&sr=8-11