What It Does
Involved in over 300 enzymatic reactions, magnesium is essential for muscle and nerve function, energy production, bone formation, and heart rhythm. It helps muscles relax after contraction and is crucial for nerve signal transmission. About 60% of your pet's magnesium is stored in bones.
What You’ll Notice
Low magnesium causes muscle tremors, weakness, abnormal heart rhythms, and poor appetite. In cats, magnesium levels in food are carefully balanced — too much can contribute to struvite crystal formation in the urinary tract, while too little causes muscle problems. The balance matters more than the amount.
Sources & Notes
Magnesium levels must be carefully controlled in cat food to prevent urinary crystals. Most urinary health diets restrict magnesium. Sources: meat, fish, whole grains, leafy greens.