Calcium supplementation linked to risk of bowel polyps

Vitamin D with calcium had three times the risk

Calcium supplements have been linked to an increased risk of bowel cancer precursor polyps in surprise findings from a long-term follow-up of a chemo-prevention trial.

Gastroenterologists found that 6-10 years after starting a supplement program, those on calcium, with or without vitamin D, were more likely to develop sessile serrated lesions.