Based on the available information, there is no evidence that Lipitor directly affects protein absorption. Lipitor, a brand-name drug for atorvastatin, is a medication used to treat high cholesterol levels and reduce the risk of heart disease [1]. It works by inhibiting HMG-CoA reductase, an enzyme that plays a crucial role in cholesterol production in the body [2].

The sources provided do not mention any side effects related to protein absorption. Instead, they list potential side effects such as muscle pain, liver enzyme abnormalities, and digestive issues like diarrhea, constipation, and bloating [1][3].

It is essential to consult healthcare professionals for personalized advice, as they can provide guidance based on individual medical histories and current health statuses.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
[2] <https://www.ncbi.nlm.nih.gov/books/NBK430779/>
[3] <https://www.ahajournals.org/doi/full/10.1161/CIRCRESAHA.118.312782>