Ganoderma lucidum (Lingzhi), known as reishi, comes from a tree fungus used in China and Japan for treatment of autoimmune diseases. It is believed to affect the immune system, but it is not known if it strengthens it. It has anti-inflammatory properties and is an antioxidant.
According to other study omega 3, omega 6, vitamin E and green tea may slow the progress of polymyositis through their effects on the inflammatory process. Study also reports vitamin D inhibits proinflammatory processes by suppressing the enhanced activity of immune cells taking part in the autoimmune reaction. Oral creatine supplements combined with at-home exercises is said to improve functional muscle performance and is used for this purpose by athletes.