This article is a study which evaluates how oxalate is absorbed in calcium oxalate stone formers. Most of the oxalate is absorbed in the proximal digestive tract and uses paracellular transport.
Link to the article
To quote this article in bibliography:
Knight, John, Juquan Jiangb, Kyle D. Wooda, Ross P. Holmesa, and Dean G. Assimos. “Oxalate and Sucralose Absorption in Idiopathic Calcium Oxalate Stone Formers." Urology 78, no. 2 (2011): 475.e9 - 475.e13. doi: https://doi.org/10.1016/j.urology.2011.04.008
