Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], it is one of the most widely prescribed drugs in the United States. However, it is important to be cautious when combining Lipitor with certain herbal supplements.

Some herbal supplements can interact with Lipitor and cause adverse effects. For example, St. John's wort, which is commonly used to treat depression, can reduce the effectiveness of Lipitor and increase the risk of side effects [2]. Other supplements, such as ginseng and garlic, can also interact with Lipitor and cause bleeding problems [2].

According to Time [3], herbal supplements are not regulated by the FDA in the same way as prescription drugs, which means that their safety and efficacy are not always well-established. In addition, the quality and purity of herbal supplements can vary widely, which can make it difficult to know exactly what you are taking.

Therefore, it is important to talk to your doctor or pharmacist before taking any herbal supplements while on Lipitor. They can help you determine whether a particular supplement is safe and appropriate for you, and can also monitor you for any potential interactions or side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] http://www.cnn.com/2010/HEALTH/02/01/moh.healthmag.remedies.avoid/index.html
[3] https://time.com/5116664/are-herbal-supplements-safe/