Fiber Therapy Caplets, 100 ct, QC99280 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Compare to the Active Ingredient in Citrucel Fiber. Helps restore and maintain regularity and relieves constipation (irregularity). Generally produces a bowel movement in 12-72 hours. 100% non-allergenic. Gentle and gluten-free.