Dietary Supplement. New! Bioactive Type II Collagen. Supports Joint Mobility*. Supports Joint Comfort*. Supports Joint Flexibility*. Gluten-Free. FLEX-Able™ is a unique combination of UC-II® and Univestin®. A reduction in joint mobility, comfort and flexibility often occurs with age. This is a growing concern for millions as this may affect a person s ability to perform some of the simplest day-to-day tasks.* U.