No, a disclaimer does not need to be notarized. Disclaimers are valid, so long as they were reasonably seen by users.
To get the most legal protection out of your disclaimers, display them in accessible places for users to see, such as linking to the disclaimer page in the website footer, and including it in the terms and conditions.
Disclaimer examples can help you determine which kind of disclaimer is suitable for your business.
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Termly allows our users to focus more on their business instead of spending countless hours figuring out data privacy compliance. - Jona, Senior Product Manager @ Termly