What should you know about vitamins for Crohn's disease?

Crohn's disease can affect different parts of the digestive tract, so inflammation, reduced appetite, food avoidance, surgery, or diarrhoea may affect nutrient intake or absorption. Common concerns include anaemia-related nutrients and vitamins involved in bone and nerve health, but treatment should follow an individual assessment. A supplement cannot control intestinal inflammation or replace disease treatment. Abdominal pain and diarrhoea may signal active disease, an infection, a medicine effect, or another problem.

Keep taking Crohn's disease treatment as prescribed and tell your gastroenterology team about every supplement, including herbal products. A blood test can help check for selected deficiencies and inflammation-related problems. Do not take high-dose products or stop medicines based on symptoms alone. Record diarrhoea, pain, appetite, weight change, and foods that seem difficult to tolerate. A GP consultation can help coordinate review, while a dietitian may help protect nutrition without unnecessarily restricting your diet.

Seek urgent care for severe or rapidly worsening abdominal pain, a swollen abdomen with vomiting, heavy rectal bleeding, faintness, inability to keep fluids down, or signs of dehydration. Contact your care team promptly if diarrhoea becomes frequent, you develop fever, or you notice marked weakness or reduced urine. A flare needs medical assessment; vitamins alone will not settle it.

Which nutrients should we check, and when? Could my current medicine or bowel surgery affect absorption? Which form and dose are suitable? How should I take a supplement if diarrhoea is active? What symptoms mean I should contact the team quickly?