Based on the available information from Mayo Clinic [${2}] and the NHS [${3}], Lipitor (atorvastatin) is a statin medication used to treat high blood cholesterol. While the sources do not explicitly mention which supplements worsen Lipitor side effects, they do provide information on potential interactions and side effects.

Common side effects of Lipitor include muscle pain, digestive issues, and increased liver enzymes [${2}, ${3}]. Some supplements, such as red yeast rice, also contain statins and may increase the risk of side effects or interactions [${2}]. Additionally, grapefruit juice can interact with Lipitor and increase the risk of side effects [${2}, ${3}].

Therefore, it is crucial to consult with a healthcare provider before combining Lipitor with any supplements or medications, including over-the-counter products [${2}, ${3}].

Sources:

* [1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
* [2] <https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013>
* [3] <https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/>