According to drug interaction information provided by Drugs.com [2], there is no known interaction between Lipitor (atorvastatin) and vitamin C. This means that taking vitamin C supplements should not affect the efficacy or safety of Lipitor. However, it is always recommended to consult with a healthcare provider before taking any new supplements or medications.

A study published in the Journal of Clinical Lipidology [3] found that the combination of atorvastatin and vitamin C supplementation may have a beneficial effect on cardiovascular risk factors in patients with type 2 diabetes. The study showed that the combination therapy improved endothelial function, reduced oxidative stress, and lowered LDL cholesterol levels in the study participants. However, it is important to note that this study was conducted in a specific population and further research is needed to confirm these findings.

Drug Patent Watch [1] provides information on the patent status of Lipitor, but does not offer any information on the interaction between Lipitor and vitamin C.

In summary, based on the available sources, there is no known interaction between Lipitor and vitamin C. However, a study suggests that the combination of atorvastatin and vitamin C may have potential benefits for certain patients. As always, it is recommended to consult with a healthcare provider before taking any new supplements or medications.

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.ncbi.nlm.nih.gov/pmc/articles/PMC3885376/