Some studies have concluded magnesium in the diet could be a primary cause of struvite urolithiasis in cats. However, researchers have found that concentrated urine (due to low levels of hydration) and alkaline urine pH are more important contributing factors. Increasing moisture intake via wet food is above all the most important preventative measure as it dilutes the urine which dissolves struvite crystals as well as encouraging urination to flush out any crystalline debris remaining in the bladder. Acidic urine also helps to dissolve struvite uroliths and discourages its formation. Commercial feline foods limit the amount of magnesium and add acidifiers such as DL-Methionine to increase urine acidity, thereby reducing the likelihood of struvite formation (alternatively, adding Vitamin C has a similar acidifying effect). However, whilst acidic urine is associated with a decrease in struvite uroliths, excessive acidity can result in an increase in calcium oxalate uroliths, low magnesium levels and urine pH both being factors in calcium oxalate formation. Oxalate uroliths are not dissolvable in cat urine.