Yes, rice protein powder is low histamine. It is generally well-tolerated, but should be avoided if you have a history of reacting to rice or issues with arsenic. Which trying to find a low histamine rice protein powder, always make it a point to read the nutrition label. A quality rice protein will contain roughly 25g of protein per ounce— containing 8 of the 9 essential amino acids (missing lysine)— and be a good source of vitamin C, iron, and folate (in the case of brown rice powder). Be sure to avoid strange chemicals, artificial & “natural” flavorings, sweeteners, dairy products, and anything ending in “-dextrin.”