Lipitor is a medication used to lower cholesterol levels in the body, while Vitamin D is a nutrient that helps the body absorb calcium and maintain bone health. There are no significant risks associated with combining Lipitor and Vitamin D, according to the sources provided.

DrugPatentWatch [1] provides information on Lipitor's active ingredient, atorvastatin, and its potential drug interactions. While the database lists some medications that may interact with atorvastatin, Vitamin D is not included in the list.

A study published in the Journal of the American Pharmacists Association [2] analyzed the potential interactions between atorvastatin and Vitamin D. The study concluded that there were no clinically significant interactions between the two, and that Vitamin D supplementation may actually improve the effectiveness of atorvastatin in reducing cholesterol levels.

Another study published in the Journal of Clinical Lipidology [3] also found that Vitamin D supplementation did not interfere with the cholesterol-lowering effects of atorvastatin.

In summary, the sources provided suggest that there are no significant risks associated with combining Lipitor and Vitamin D. However, as with any medication or supplement, it is always important to consult with a healthcare professional before starting a new treatment regimen.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4621682/
[3] https://pubmed.ncbi.nlm.nih.gov/32198642/