Early animal work showed resveratrol calms colitis inflammation and cytokines [1].
In a randomized, double-blind, placebo-controlled trial of adults with mild–moderate UC, 500 mg/day resveratrol for 6 weeks improved clinical disease activity and quality of life, with reductions in inflammatory markers versus placebo [2].
Recent reviews conclude resveratrol remains a promising adjunct—supported by consistent preclinical data and emerging human evidence—though larger trials are still needed [3]. Resveratrol is found in grapes (among other things). Sometimes the whole food works well. 

Educational only; work with doctors trained in natural healthcare.

  1. Cancer Prev Res (Phila). 2010 Mar 23;3(4):549–559.
  2. Arch Med Res. 2015 May;46(4):280-5. Anti-Inflammatory Effects of Resveratrol in Patients with Ulcerative Colitis: A Randomized, Double-Blind, Placebo-controlled Pilot Study
  3. Nutr Res Rev. 2018 Jun;31(1):85-97. Resveratrol and inflammatory bowel disease: the evidence so far