Based on the information available, there is no direct evidence to suggest that taking Lipitor, a medication used to treat high cholesterol, interferes with magnesium absorption in the human body.

Lipitor, also known as atorvastatin, is a statin medication that works by blocking a substance your body needs to make cholesterol [1]. On the other hand, magnesium is a mineral that is crucial for the body's function, including nerve and muscle function, protein synthesis, and blood pressure regulation [2].

While there are reports of certain medications, such as antibiotics and proton pump inhibitors, affecting magnesium absorption [3], there is no specific mention of Lipitor having such an effect.

However, it's always important to consult with a healthcare provider or pharmacist before starting any new medication or supplement, including Lipitor and magnesium, to ensure there are no potential interactions or adverse effects [4].

Sources:
[1] "Lipitor." Mayo Clinic, Mayo Foundation for Medical Education and Research, 15 Sept. 2021, www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/drugs-treatments/lipitor/drg-20069511.
[2] "Magnesium." National Institutes of Health, U.S. Department of Health and Human Services, 11 Feb. 2021, ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/.
[3] "Medications That Can Lower Magnesium Levels." Cleveland Clinic, my.clevelandclinic.org/health/articles/15662-medications-that-can-lower-magnesium-levels.
[4] "Atorvastatin (Oral Route) Side Effects." Mayo Clinic, Mayo Foundation for Medical Education and Research, 15 Sept. 2021, www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20069511.