Magnesium is one of the most common mineral deficiencies. Symptoms of deficiency include: Insomnia, stress, muscle cramping or twitching, heart palpitations, anxiety, high blood pressure, headaches, restless legs among many more. It's also associated with chronic fatigue, fibromyalgia, type 2 diabetes and osteoporosis to name a few.
Magnesium is involved in over 300 metabolic processes in the body, no wonder it has such wide ranging symptoms.
Supplemental forms vary in efficacy but to break it down real quick:
Mg Bisglycinate - most absorbable
Mg Threonate - for the brain
Mg Malate - muscles and fatigue
Mg Citrate - moderate, mildly laxative
Mg Oxide - low absorption, high laxative effect
Food sources: leafy greens, dark chocolate, avocado, nuts, seeds, fatty fish, legumes and tofu