Getting too much calcium can cause constipation. It might also interfere with the body’s ability to absorb iron and zinc, but this effect is not well established. In adults, too much calcium (from dietary supplements but not food) might increase the risk of kidney stones. Some studies show that people who consume high amounts of calcium might have increased risks of prostate cancer and heart disease, but more research is needed to understand these possible links.
The upper limits for calcium are listed below. Most people do not get amounts above the upper limits from food alone; excess intakes usually come from the use of calcium supplements. Surveys show that some older women in the United States probably get amounts somewhat above the upper limit since the use of calcium supplements is common among these women.
Life Stage Upper Limit
Birth to 6 months 1,000 mg
Infants 7–12 months 1,500 mg
Children 1–8 years 2,500 mg
Children 9–18 years 3,000 mg
Adults 19–50 years 2,500 mg
Adults 51 years and older 2,000 mg
Pregnant and breastfeeding teens 3,000 mg
Pregnant and breastfeeding adults 2,500 mg

Linna 

Attending physician
Linna Attending physician
Dr. Linna,a Tongji University and several III grade hospitals trained specialist, received her medical degree in 2001, and has18 years of clinical experience. DrLinna is proficient in the diagnosis and treatment of commonly occurring Orthopedics and surgical diseases, such as sports injuries or trauma to the back, neck, shoulder, knee, ankle, and other joints, as well as surgical Congenital disease management. Dr. Linna’s specialist expertise includes minimally invasive surgery, Mainipulation replacement for Fracture or Dislocatio and combined with new diagnostic techniques in treating pediatric surgical diseases.