Any treatment can fail, and they do every day. With thousands of possible variables there are no guarantees with any of them, natural or otherwise.
I use, or have used, conventional, natural, complimentary, and alternative treatments. You have to find what works for you personally.
I use Turmeric, Ginger, Krill oil, MSM specifically for inflammation. It is not enough to keep me my Crohns at bay. Neither was LDN, Imuran or Lialda.
Try everything, but don't get married to any of them. If they do not work, try something else. What is important is that it improves your condition. I still take the supplements, but they are not my main treatment. I would, and did take most of them prior to diagnosis, and for other benefits not specifically for Crohn's.
Good luck.
Dan