Some people find help with cucurmin plus piperine, but that's a really nasty disease. Piperine increases absorption or slows metabolism of several drugs, so research is important if they are taking any rx meds.
Sugar and simple carbs are known to really increase inflammation, so drastically cutting back on those may help. I know a woman in her 80s who has had RA since her early thirties. She was a very early adopter of an organic diet, low carbs, almost zero simple sugars, and lots of fresh vegetable juices. Remarkably, she has never needed a joint replacement, takes NO prescription meds, and walks without a cane. Her hands show no deformity, and she's more active than many women half her age.
That, of course, is more than most people are willing to do, but it sure worked for her.
Summerthyme