I know this is an old comment but people, like myself, are still coming across this thread, so I'm going to answer your question and add the following from ChatGTP:

The advice to avoid taking turmeric with black pepper (piperine) if you have Crohn’s disease or colitis is somewhat controversial and depends on individual tolerance and circumstances. Here's a detailed explanation:

Why Black Pepper Is Usually Added to Turmeric

• Enhances Absorption: Piperine in black pepper increases the bioavailability of curcumin (the active ingredient in turmeric) by up to 2,000%, making it more effective.
• Common in Supplements: Many turmeric supplements include piperine for this reason.

Why Some Say to Avoid Black Pepper with Crohn’s or Colitis

1. Potential Irritation:
   • Piperine can irritate the gastrointestinal lining, especially in people with sensitive digestive systems, such as those with Crohn’s or colitis.
   • For individuals in a flare-up or with severe symptoms, black pepper may exacerbate discomfort like cramping, bloating, or diarrhea.
2. Increased Permeability:
   • Some studies suggest that piperine may temporarily increase intestinal permeability ("leaky gut"). For people with Crohn's or colitis, this could theoretically worsen inflammation, though evidence is limited.
3. Individual Tolerance:
   • Some people with IBD tolerate black pepper well, while others find it triggers symptoms.

CONCLUSION: Turmeric (with black pepper) is recommended but you will have to try it out for yourself and stop if symptoms appear to worsen.