Yoga exercises could stimulate the passage of (green) food and/or (originally green) bile through your bowel, and then either the food or bile would color the stool green. If stools are loose and contain undigested food, you are losing nutrients this way.
Excessive use of magnesium supplements can be toxic. The upper limit -- the highest dose a person can take -- of magnesium supplements is: 65 mg/day for children ages 1-3. 110 mg/day for children ages 4-8. 350 mg/day for adults and children ages 9 and up.
Best Answer: The Recommended Daily Allowance for magnesium is about 300 mg per day. For potassium, it's 3500 mg. But since there is magnesium and potassium in almost everything you eat, most people have no problem getting the amount they need without supplements.