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.
Increasing Calcium Absorption Rates. 1  1. Increase your magnesium intake. Magnesium helps your body take in the calcium. 2  2. Take multiple smaller doses of calcium. If your supplement needs are greater than 500 milligrams per day after accounting for the calcium consumed in your diet, split up your supplement.