While many herbs are known to aid digestion and nutrient absorption, there is limited scientific evidence indicating that specific herbs directly hinder protein absorption. However, one study published in the "Journal of Agricultural and Food Chemistry" [1] suggests that green tea catechins may inhibit protein digestion and absorption in the small intestine.

The study found that green tea catechins, specifically epigallocatechin gallate (EGCG), formed complexes with proteins, which could potentially reduce protein digestion and absorption. The researchers suggest that this interaction might be responsible for the lower bioavailability of protein in individuals who consume green tea.

It is important to note that this study focuses on green tea catechins and not other herbs. Furthermore, the findings do not necessarily imply that green tea consumption will significantly hinder protein absorption in a typical diet.

In summary, while there is some evidence suggesting that green tea catechins may inhibit protein absorption, more research is needed to confirm these findings and determine the clinical significance.

Sources:

1. [Journal of Agricultural and Food Chemistry](https://pubs.acs.org/doi/abs/10.1021/jf304462y): Inhibition of Protein Digestion by Green Tea Catechins and Its In Vitro and In Vivo Evaluation