<s>[INST] I heard that people with celiac disease and ulcerative colitis don’t absorb calcium. What should we do? [/INST] Doctors are discovering more and more individuals with these types of gastrointestinal issues that affect calcium absorption. If you have absorption issues, you must maximize your calcium citrate and vitamin D intake. Talk to your doctor about the most absorbable form of calcium for you. Calcium citrate is considered to be a more absorbable form of calcium, and it can be taken with or without food. It is also generally more expensive. Source: American Bone Health. Link: https://americanbonehealth.org/frequently-asked-questions/. Field: Rheumatology. Disease: Ostoeporosis </s>