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While Lipitor (atorvastatin) is a widely prescribed medication for lowering cholesterol levels, there is limited information available on specific interactions between herbs and Lipitor. The Mayo Clinic suggests that Ginkgo biloba, a commonly used herb, may interact with certain medications by affecting how the liver processes drugs. However, there is no specific mention of an interaction between Ginkgo biloba and Lipitor on the Mayo Clinic's website [2]. Additionally, a study published on the National Center for Biotechnology Information's website did not directly address any interactions between herbs and Lipitor [3].

In conclusion, while it is always advisable to consult with a healthcare professional before combining medications with herbs, the available sources do not provide direct evidence of herbs decreasing the effectiveness of Lipitor.

Sources:
[2] https://www.mayoclinic.org/drugs-supplements-ginkgo/art-20362032
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4593660/