Review of isolation, structural properties, chain conformation, and bioactivities of psyllium polysaccharides.
Zhang J, Wen C, Zhang H, Duan Y.
Int J Biol Macromol. 2019 Aug 2;139:409-420. doi: 10.1016/j.ijbiomac.2019.08.014.  

Comparing the chemical composition of dietary fibres prepared from sugarcane, psyllium husk and wheat dextrin.
Chong RWW, Ball M, McRae C, Packer NH.
Food Chem. 2019 Nov 15;298:125032. doi: 10.1016/j.foodchem.2019.125032.

Supplementation with psyllium seed husk reduces myocardial damage in a rat model of ischemia/reperfusion.
Lim SH, Lee J.
Nutr Res Pract. 2019 Jun;13(3):205-213. doi: 10.4162/nrp.2019.13.3.205.

Physicochemical, scavenging and anti-proliferative analyses of polysaccharides extracted from psyllium (Plantago ovata Forssk) husk and seeds.
Patel MK, Tanna B, Gupta H, Mishra A, Jha B.
Int J Biol Macromol. 2019 Jul 15;133:190-201. doi: 10.1016/j.ijbiomac.2019.04.062.

The effects of psyllium supplementation on body weight, body mass index and waist circumference in adults: A systematic review and dose-response meta-analysis of randomized controlled trials.
Darooghegi Mofrad M, Mozaffari H, Mousavi SM, Sheikhi A, Milajerdi A.
Crit Rev Food Sci Nutr. 2019 Mar 18:1-14. doi: 10.1080/10408398.2018.1553140

The Effect of Psyllium Husk on Intestinal Microbiota in Constipated Patients and Healthy Controls.
Jalanka J, Major G, Murray K, Singh G, Nowak A, Kurtz C, Silos-Santiago I, Johnston JM, de Vos WM, Spiller R.
Int J Mol Sci. 2019 Jan 20;20(2). pii: E433. doi: 10.3390/ijms20020433.

Effect of flaxseed or psyllium vs. placebo on management of constipation, weight, glycemia, and lipids: A randomized trial in constipated patients with type 2 diabetes.
Soltanian N, Janghorbani M.
Clin Nutr ESPEN. 2019 Feb;29:41-48. doi: 10.1016/j.clnesp.2018.11.002.

Effect of Psyllium Fiber Supplementation on Diarrhea Incidence in Enteral Tube-Fed Patients: A Prospective, Randomized, and Controlled Trial.
Lertpipopmetha K, Kongkamol C, Sripongpun P.
JPEN J Parenter Enteral Nutr. 2019 Aug;43(6):759-767. doi: 10.1002/jpen.1489.

Safety

Intestinal obstruction caused by a laxative drug (Psyllium): A case report and review of the literature.
Hefny AF, Ayad AZ, Matev N, Bashir MO.
Int J Surg Case Rep. 2018;52:59-62. doi: 10.1016/j.ijscr.2018.10.001.