Based on the available information, there is no direct research or evidence suggesting that an iron-rich plant-based diet has an impact on Lipitor's effectiveness. Lipitor, also known as atorvastatin, is a medication used to treat high cholesterol levels [1]. Its effectiveness is primarily determined by how the body metabolizes the drug, which can be influenced by various factors such as genetics, liver function, and the presence of certain enzymes [1].

However, it is worth noting that certain plant-based foods, such as those rich in niacin (vitamin B3), can affect cholesterol levels. Niacin has been shown to increase HDL (good) cholesterol levels and decrease LDL (bad) cholesterol levels [2]. This could potentially impact the effectiveness of Lipitor, as both niacin and Lipitor are used to manage cholesterol levels. However, the available information does not provide specific details on the impact of an iron-rich plant-based diet on Lipitor's effectiveness.

Additionally, iron itself does not have a known impact on cholesterol levels or the metabolism of Lipitor [3]. Therefore, it is unlikely that an iron-rich plant-based diet would have a significant impact on Lipitor's effectiveness.

In summary, while certain plant-based foods can affect cholesterol levels, there is no direct evidence or research suggesting that an iron-rich plant-based diet has an impact on Lipitor's effectiveness. As with any medication, it is important to consult with a healthcare provider for personalized advice and recommendations.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/LIPITOR>
[2] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10058246/>
[3] <https://ods.od.nih.gov/factsheets/Niacin-HealthProfessional/>