According to the sources provided, there is no significant interaction between Lipitor (atorvastatin) and vitamin C. The website DrugPatentWatch [1] provides information on the patent status of drugs, including Lipitor, but does not mention any interaction between atorvastatin and vitamin C. Drugs.com [2] also states that there are no known interactions between Lipitor and vitamin C. However, the website ConsumerLab [3] mentions that high doses of vitamin C (more than 1 gram per day) may decrease the effectiveness of statins, including atorvastatin, but this is not considered a significant interaction. It is always recommended to consult with a healthcare professional before taking any new medication or supplement, especially if you are taking other medications or have any underlying medical conditions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.drugs.com/drug-interactions/atorvastatin-with-vitamin-c-276-0-238-3823.html
[3] https://www.consumerlab.com/answers/which-drugs-should-be-avoided-when-taking-statins/statin-supplement-interactions/