Bladder supplements come from the urinary bladders of animals, usually pigs or cattle. The tissue is dried, ground, and sold as a powder or in capsules.
These supplements grew out of a traditional idea called organotherapy, or "like supports like." The belief is that eating a specific animal organ can shore up the same organ in a person. That historical practice is the main backdrop for bladder supplements today.
No solid scientific evidence shows that swallowing bladder tissue directly helps a human bladder work better or stay healthy. The material does not supply a verified, useful compound for the urinary system. For that reason, use stays in the realm of tradition, not clinical data.
Trustworthy dosage guidelines do not exist because amounts swing wildly between products. Side effects and overall safety have not been carefully researched.