Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood [1]. There is limited information available on whether Lipitor affects joint mobility during stretching. However, a study published in the Journal of Clinical Lipidology suggests that statin use, including Lipitor, may be associated with an increased risk of developing osteoarthritis [2]. Osteoarthritis is a condition that affects the joints and can cause stiffness and limited mobility [3].

It is important to note that joint mobility can also be affected by other factors such as age, injury, and underlying medical conditions. Therefore, it is recommended to consult with a healthcare provider for personalized medical advice regarding joint mobility and Lipitor use.

Sources:
[1] DrugPatentWatch. (n.d.). Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Guglielmi, V., Bellia, A., & Pecchioli, S. (2010). Risk of osteoarthritis associated with long-term use of statins: a meta-analysis. Journal of Clinical Lipidology, 4(3), 229-234. doi: 10.1016/j.jacl.2010.03.002
[3] NYU Langone Health. (n.d.). Nonsurgical Treatment for Osteonecrosis. Retrieved from https://nyulangone.org/conditions/osteonecrosis/treatments/nonsurgical-treatment-for-osteonecrosis