Lipitor is a brand name for the medication atorvastatin, which is used to lower cholesterol levels in the blood. According to the National Health Service (NHS) [2], it is generally safe to take atorvastatin with most herbs, but there are some exceptions. The NHS advises against taking St. John's wort, as it can reduce the effectiveness of atorvastatin and increase the risk of side effects. It is also recommended to avoid grapefruit juice, as it can increase the level of atorvastatin in the blood and potentially lead to side effects.

The Mayo Clinic [3] specifically mentions that ginkgo, an herb commonly used for memory and cognitive enhancement, may interact with atorvastatin. Ginkgo can increase the risk of bleeding, and when combined with atorvastatin, it may increase the risk of bleeding even further.

It is important to note that herbal supplements are not regulated in the same way as prescription medications, and their safety and effectiveness may not be well-established. It is always a good idea to talk to a healthcare provider before taking any new supplements or medications, especially if you are taking other medications.

Sources:
[2] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/
[3] https://www.mayoclinic.org/drugs-supplements-ginkgo/art-20362032