Lipitor is a brand name for the drug atorvastatin, which is a type of medication known as a statin. Statins are used to lower cholesterol levels in the blood, which can help prevent heart disease and stroke [1]. According to a study published in the Journal of Clinical Endocrinology and Metabolism, taking atorvastatin may decrease the absorption of vitamin D [2]. Vitamin D is an essential nutrient that helps the body absorb calcium, which is important for bone health [3]. The study found that people taking atorvastatin had lower levels of vitamin D in their blood than those not taking the medication [2]. However, the study did not determine whether this decrease in vitamin D levels was due to a direct effect of atorvastatin on vitamin D absorption or due to other factors, such as decreased exposure to sunlight [2]. Therefore, it is important for people taking atorvastatin to have their vitamin D levels checked regularly and to talk to their healthcare provider about any concerns they may have about vitamin D absorption [3].

Sources:
[1] DrugPatentWatch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Prueksaritanond, S., et al. (2008). Effects of Atorvastatin on Vitamin D Levels in Patients with Acute Coronary Syndrome. Journal of Clinical Endocrinology and Metabolism, 93(8), 2996-2999. doi: 10.1210/jc.2008-0521
[3] Mayo Clinic. Vitamin D. Retrieved from https://www.mayoclinic.org/drugs-supplements-vitamin-d/art-20363792