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.
Government guidelines suggest 1,000-1,200 milligrams (mg) of calcium per day is adequate, but RealAge recommends a bit more: 1,000-1,500 mg per day from food and calcium supplementsâbut not all at once. Your body can absorb only 500-600 mg at a time, so divide it into two or three doses over the course of a day.