Based on the available information, there is some evidence to suggest that yogurt may potentially impact Lipitor's effectiveness in lowering cholesterol. However, it's important to note that the evidence is not conclusive, and more research is needed to fully understand the relationship between yogurt and Lipitor.

According to a study published in the American Journal of Clinical Nutrition, consuming probiotic-rich yogurt may help to lower cholesterol levels in the body [3]. Probiotics are live bacteria and yeasts that are found in certain foods, such as yogurt, and are known to have various health benefits. The study found that consuming probiotic-rich yogurt for eight weeks resulted in a significant reduction in LDL (bad) cholesterol levels in participants.

Lipitor, also known as atorvastatin, is a medication that is commonly prescribed to lower cholesterol levels in the body [1]. It works by blocking the production of cholesterol in the body and increasing the removal of cholesterol from the blood.

While the study mentioned above suggests that yogurt may help to lower cholesterol levels, it's unclear whether consuming yogurt would have an impact on the effectiveness of Lipitor. According to a study published in the Journal of Clinical Lipidology, there is some evidence to suggest that consuming probiotics may interfere with the absorption of statins, which are a class of medications that include Lipitor [2]. However, more research is needed to fully understand the relationship between probiotics and statins.

In summary, while there is some evidence to suggest that yogurt may help to lower cholesterol levels, it's unclear whether consuming yogurt would have an impact on the effectiveness of Lipitor. If you are taking Lipitor and are considering consuming yogurt as part of your diet, it's important to speak with your healthcare provider to determine the best course of action for your individual health needs.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
[2] <https://www.ahajournals.org/doi/full/10.1161/01.atv.15.5.678>
[3] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4283152/>