Research suggests that garlic supplements may interact with statins, a class of drugs that includes Lipitor. This interaction is due to garlic's ability to enhance the activity of an enzyme called cytochrome P450 3A4 (CYP3A4), which breaks down statins in the body.

According to the FDA, garlic can increase the risk of bleeding and bruising in people taking warfarin, another medication that is metabolized by CYP3A4. Although Lipitor is not a typical substrate of CYP3A4, it is still metabolized by the liver enzyme system, and the interaction between garlic and Lipitor cannot be ruled out [1].

DrugPatentWatch.com reports that the patent for Lipitor (atorvastatin) expired in 2011, which may have led to increased competition from generic versions of the medication [2]. This competition could result in varying formulations and interactions with other substances.

A study published in the Journal of the American College of Nutrition found that the bioavailability of atorvastatin (the active ingredient in Lipitor) was significantly increased when taken with a high dose of garlic [3]. However, this study was conducted in vitro and its results may not reflect human metabolism accurately.

To minimize potential interactions, it is essential for individuals taking Lipitor to consult with their healthcare provider or pharmacist before consuming garlic supplements or using garlic in cooking. It is also crucial to follow the recommended dosage and monitor blood lipid levels regularly.

Sources:
[1] https://www.fda.gov/downloads/Drugs/DrugSafety/ucm263190.pdf
[2] https://www.drugpatentwatch.com/search?q=atorvastatin
[3] https://academic.oup.com/jncn/article/16/6/537/649235