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Yes, there are known interactions between herbs and Lipitor (atorvastatin), a medication used to treat high cholesterol levels. According to Drugs.com, Lipitor can interact with various herbal products, such as red yeast rice, St. John's wort, and niacin (vitamin B3) [1].

Red yeast rice, a dietary supplement, contains monacolin K, a compound chemically identical to lovastatin, another cholesterol-lowering drug. Combining red yeast rice with Lipitor can increase the risk of muscle damage (rhabdomyolysis) and kidney damage [1].

St. John's wort, an herbal supplement used to treat depression, can reduce the effectiveness of Lipitor by speeding up its metabolism in the liver [1].

Niacin, a B-vitamin, is sometimes used in conjunction with Lipitor to treat high cholesterol levels. However, high-dose niacin can increase the risk of muscle damage when taken with Lipitor [1].

It is crucial to consult a healthcare provider before starting or stopping any herbal supplement while taking Lipitor, as interactions can occur [1].

Sources:
[1] <https://www.drugs.com/drug-interactions/atorvastatin-index.html?filter=13&generic_only=Y>