Lipitor, also known as atorvastatin, is a prescription medication used to lower cholesterol levels in the blood. According to the National Health Service (NHS) [3], there are some potential adverse effects of mixing Lipitor with certain herbs. For example, St. John's Wort, a herbal supplement commonly used to treat depression, can reduce the effectiveness of Lipitor and increase the risk of side effects. Additionally, grapefruit juice can also interact with Lipitor and increase the risk of side effects.

The study published in the US National Library of Medicine [2] also confirms that some herbs and dietary supplements can interact with atorvastatin, including St. John's Wort, ginkgo biloba, and garlic. These interactions can cause serious adverse effects, such as muscle pain and liver damage. Therefore, it is important to talk to a healthcare provider before taking any herbal supplements while on Lipitor.

Furthermore, the Drug Patent Watch [1] provides information on the active ingredients in Lipitor and its potential interactions with other drugs, but does not specifically mention any interactions with herbs.

In conclusion, there are potential adverse effects of mixing Lipitor and certain herbs, such as St. John's Wort and grapefruit juice. It is important to consult a healthcare provider before taking any herbal supplements while on Lipitor to avoid any harmful interactions.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4593660/
[3] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/