Lipitor, or atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the sources provided, there are some vitamins and supplements that may interact with Lipitor.

ConsumerLab [2] states that grapefruit and grapefruit juice should be avoided when taking Lipitor, as they can increase the risk of side effects. Additionally, the source notes that taking large doses of niacin (vitamin B3) may increase the risk of muscle damage when taken with Lipitor.

SingleCare [3] adds that taking coenzyme Q10 (CoQ10) supplements may help reduce muscle pain associated with Lipitor use. However, the source also notes that taking St. John's wort may decrease the effectiveness of Lipitor.

Drug Patent Watch [1] does not provide information on specific vitamin or supplement interactions with Lipitor.

In summary, grapefruit and grapefruit juice should be avoided when taking Lipitor, and large doses of niacin may increase the risk of muscle damage. CoQ10 supplements may help reduce muscle pain, but St. John's wort may decrease the effectiveness of Lipitor. It is important to speak with a healthcare provider before taking any new vitamins or supplements while on Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[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/