Lipitor is a brand name for the drug atorvastatin, which is a statin medication used to lower cholesterol levels in the body. While taking Lipitor, there are certain supplements that should be avoided due to potential interactions that could impact the effectiveness of the medication or cause adverse side effects.

According to ConsumerLab [2], some supplements that should be avoided while taking statins, including Lipitor, are red yeast rice, St. John's wort, and grapefruit juice. Red yeast rice contains a compound that is similar to the active ingredient in statins, and taking both together can increase the risk of side effects such as muscle pain and liver damage. St. John's wort can reduce the effectiveness of Lipitor and increase the risk of side effects. Grapefruit juice can increase the level of Lipitor in the blood, which can increase the risk of side effects.

SingleCare [3] adds that other supplements that should be avoided while taking Lipitor include niacin, vitamin D, and coenzyme Q10. Niacin can increase the risk of muscle damage when taken with statins, while vitamin D can reduce the effectiveness of Lipitor. Coenzyme Q10 can also reduce the effectiveness of statins, although the evidence is not yet conclusive.

It is important to note that these interactions are not exhaustive, and there may be other supplements or medications that should be avoided while taking Lipitor. Therefore, it is always best to consult with a healthcare provider before starting any new supplements or medications, especially if you are already taking Lipitor.

Sources:
[2] https://www.consumerlab.com/answers/which-drugs-should-be-avoided-when-taking-statins/statin-supplement-interactions/
[3] https://www.singlecare.com/blog/atorvastatin-interactions/
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR