Rice protein powder can potentially cause constipation for some individuals as some people may have digestive issues with rice products. The prevalence of constipation caused by rice protein powder is not well documented.
To alleviate constipation, it's recommended to drink plenty of water, eat a balanced diet with fiber-rich foods, and engage in physical activity. Additionally, taking a probiotic supplement and increasing the intake of magnesium-rich foods can also help with regular bowel movements. If constipation persists, it's best to consult with a healthcare professional.