This site does very little with information about you, and this page says exactly what.
The contact form
The form asks for your name, your email address, a message, and a tick to say you understand that Astaroa cannot give clinical advice. When you press Send, the site emails those four things to the people who run Astaroa and shows you the page again. It writes nothing to the server.
The email stays in their mailboxes for as long as they keep their mail. If you want it deleted, say so through the same form and it will be.
Nothing else
The site does not set cookies or run analytics. The fonts, the images and the stylesheet all come from astaroa.com, so no other company is told that you were here. The web server keeps the usual access logs, as web servers do.
Questions
Use the contact form.