Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the body. According to Drug Patent Watch [1], the recommended starting dose of Lipitor for most adults is 10-20 mg once daily. However, the dose may be increased up to 80 mg once daily depending on the patient's response to the medication and the severity of their condition.

A study published in the Journal of Clinical Lipidology [2] found that high-fat diets can have a negative impact on the effectiveness of statin medications like Lipitor. The study suggests that patients on high-fat diets may require higher doses of statins to achieve the desired cholesterol-lowering effects.

It is important to note that Lipitor and other statins can have side effects, including muscle pain and weakness, liver damage, and an increased risk of diabetes. Therefore, patients should only take Lipitor under the guidance of a healthcare provider who can monitor their cholesterol levels and adjust their dosage as needed.

Additionally, the Office of Dietary Supplements [3] recommends that adults consume 600-800 IU of vitamin D daily to maintain healthy bones and overall health. However, it is important to talk to a healthcare provider before taking vitamin D supplements, as high doses can be harmful.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/21269482/
[3] https://ods.od.nih.gov/factsheets/VitaminD-Consumer/