Those uses are said to be true in folklore. The main use of urine in magic is usually to place a hex against somebody. For example, putting their name in a jar and filling it with your urine, then casting a spell involving that jar.
Folklore has also said that one should place urine in a 'witch bottle' to prevent against harmful magic or hexes.
In Hoodoo, as well as Italian and European folk culture, urine is used in a woman's coffee as a love spell, as a substitute for menstrual blood. (Menstrual blood is used quite a lot in Hoodoo.) This method can also be used to 'tie' a woman.
In history, an enemy who gets your urine can cause grave damage to you by stopping it up in a bottle with red pepper and Graveyard Dirt.The result will be urinary tract problems, ranging from cystitis and nephritis to prostatitis and kidney stones. The only way to take off such a condition is to find the bottle and destroy it, letting the urine run out into a fire.
Aman can use his own urination to cure a case of impotence that was put on him through magic. Urinating on a knife blade and letting the urine run on the ground is one of many methods for accomplishing this. Another is to urinate into a red ants nest. Women who have had their natures hoodooed can urine into a running river as they call on the river to take off the jinx.
Body fluids are often used in certain types magic, ranging for urine to menstrual blood, from menstrual blood to semen.
Hope this helps.