Frontier Bulk Psyllium Seed Husk Powder Organic, 25 Lb. Box

What the brand says

Kosher Plantago ovata Forssk.Warning-Taking this product without adequate fluid may cause it to swell and block your throat or esophagus and may cause choking. Do not take this product if you have difficulty in swallowing. If you experience chest pain, vomiting, or difficulty in swallowing or breathing after taking this product, seek immediate medical attention. Take with at least 8 ounces of liquid. Contraindicated in bowel obstruction; take other drugs one hour prior to consumption of psyllium.