Supports Urinary Tract Health. Imbalances of the urinary tract are widespread and it is estimated that 20 percent of women will experience them. Source Naturals D-Mannose supports the health of the entire urinary tract: the urethra bladder ureter renal pelvis and renal parenchyma. D-Mannose is a monosaccharide hexose sugar naturally found in some trees berries and fruits such as cranberry. It complements the body's natural cleansing process.