When taking Lipitor (atorvastatin), it is essential to be cautious with herbal supplements due to potential interactions. Some herbs may interfere with the effectiveness of Lipitor or cause adverse effects. The National Health Service (NHS) advises avoiding St. John's Wort while taking atorvastatin, as it can reduce the drug's effectiveness [2]. Additionally, Medical News Today warns against consuming grapefruit or grapefruit juice, as they can increase the levels of atorvastatin in the body, leading to a higher risk of side effects [3]. It is crucial to consult with a healthcare provider before combining Lipitor with any herbal supplements to ensure safety and effectiveness.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/
[3] https://www.medicalnewstoday.com/articles/drugs-lipitor-interactions.