Hello,
We cannot specifically say our product is used to treat any "disease" however there have been studies completed by Dermatology Times that show people with Rosacea have a decreased Collagen content compared to others without it.
I hope this answers your question. Feel free to reach out directly to us if you have any more questions.
Thank you for contacting Lunakai and have a nice day.
Warmly,
Bella D.
Lunakai Customer Service Manager
Nashville, TN, USA