Based on the information provided, there is no specific probiotic that has been identified as one that should be avoided when taking Lipitor (atorvastatin), a medication used to treat high cholesterol. However, it's always important to consult with a healthcare provider before starting any new supplement, including probiotics, while taking prescription medications like Lipitor.

The National Health Service (NHS) of the United Kingdom states that there are generally no interactions between atorvastatin and probiotics, but it's always best to consult with a healthcare provider for personalized advice [2].

ConsumerLab.com, an independent evaluator of health and nutrition products, mentions that certain supplements, including red yeast rice, coenzyme Q10, and niacin, may interact with statins like Lipitor [3]. However, they do not specifically list probiotics as a supplement to avoid.

In summary, there is no evidence or specific recommendation to avoid taking probiotics while on Lipitor. However, it's always best to consult with a healthcare provider before starting any new supplement regimen.

Sources:

1. Lipitor. DrugPatentWatch. <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
2. Atorvastatin (the active ingredient in Lipitor). NHS. <https://www.nhs.uk/medicines/atorvastatin/>
3. Which drugs should be avoided when taking statins? ConsumerLab.com. <https://www.consumerlab.com/answers/which-drugs-should-be-avoided-when-taking-statins/statin-supplement-interactions/>