Manganese mineral by Ray Sahelian, M.D.

Manganese is a mineral found naturally in the environment and is also released into the air from mining and manufacturing operations and from combustion of gasoline additives. People get exposed to manganese through breathing air and dust contaminated with manganese. Manganese mineral plays a critical role in many metabolic processes, including reproduction.

Manganese in food
The body needs tiny amounts of manganese, and it's found as a trace mineral in foods such as whole grains, fruits and vegetables.

Manganese and fertility
High intake or too little environmental exposure to the mineral manganese can reduce sperm quality and quantity. This may influence male infertility. Trace amounts of manganese are needed for normal sperm function, but high levels have been shown to harm male fertility. Men with high manganese levels have a greater likelihood of low sperm motility and to have low sperm counts. Low blood manganese levels are also associated with low sperm motility. Epidemiology, March 2007.

Manganese toxicity and Parkinson's disease
People exposed to the metal manganese through industrial pollution may be at increased risk of Parkinson-like problems like tremors and impaired movement. Manganese is used in steel production and as a coating on welding rods, among other industrial applications. Overexposure to manganese is known to damage nerve cells, potentially causing Parkinson-like problems known as manganism -- including tremors, slowed movement and unsteady gait.