Here’s a clean, legally cautious disclaimer you can paste into your eBay listings. It’s written to clearly distance you from Mary Kay while covering the main liability points:

Disclaimer:
This listing is not affiliated with, endorsed by, or sponsored by Mary Kay Inc. All trademarks, brand names, and logos are the property of their respective owners and are used for identification purposes only.

I am not a Mary Kay® Independent Beauty Consultant, distributor, or representative. The items listed are purchased through legitimate means and are being resold under the first-sale doctrine.

These products are sold “as is” without any warranties, express or implied, including but not limited to warranties of authenticity, merchantability, or fitness for a particular purpose. I do not provide any manufacturer warranties or guarantees.

Any questions regarding the product line, ingredients, or official guarantees should be directed to Mary Kay Inc. directly.