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Based on the information available, there is limited research directly investigating Lipitor's impact on gut protein metabolism. Lipitor, also known as atorvastatin, is a statin medication commonly prescribed to lower cholesterol levels and reduce the risk of heart disease [1].

While there is an abundance of research on Lipitor's effects on cholesterol and cardiovascular health, studies specifically examining its relationship with gut protein metabolism are scarce. However, there is some research indicating that statins, including Lipitor, may have an impact on gut microbiota [2].

A study published in the journal Nature in 2019 found that statins can alter the composition of gut bacteria, which could potentially influence various metabolic processes [3]. However, this study did not specifically focus on protein metabolism.

In conclusion, while there is some evidence to suggest that Lipitor may have an impact on gut microbiota, there is a lack of direct research on its effects on gut protein metabolism.

Sources:
[1] "Atorvastatin." MedlinePlus, U.S. National Library of Medicine, 15 Feb. 2022, medlineplus.gov/druginfo/meds/a601245.html.
[2] Wong, Jennifer Y. N., et al. “Statins and the Gut Microbiome: A Systematic Review.” European Journal of Clinical Microbiology & Infectious Diseases, Springer-Verlag, 14 Jan. 2021, link.springer.com/article/10.1007/s10096-020-04013-z.
[3] Wastyk, Holly, et al. “Potent Heritable Impacts of Host Genotype and Diet on Gut Bacteria.” Nature, vol. 568, no. 7753, 2019, pp. 500–506., doi:10.1038/s41586-019-1090-3, nature.com/articles/s41586-019-1090-3.