Based on the available information, there is no specific herb that directly boosts protein absorption. However, there are natural digestive enzymes that can aid in the digestion and absorption of proteins. These enzymes, which include proteases, help break down proteins into smaller peptides and amino acids, making them easier for the body to absorb [2].

One such source of these enzymes is papaya, which contains a protease called papain [2]. Another source is pineapple, which contains bromelain, another type of protease [2].

It's important to note that while these enzymes can aid in protein digestion and absorption, they are not a direct boost to protein absorption. The process of protein absorption is complex and involves many factors, including the type of protein, the presence of other nutrients, and the individual's digestive health [1][3].

In conclusion, while there are no herbs that directly boost protein absorption, consuming foods rich in protease enzymes like papaya and pineapple can aid in protein digestion and absorption.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/PROTEIN>
[2] <https://www.healthline.com/nutrition/natural-digestive-enzymes>
[3] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9219084/>