Can evening primrose cause heartburn

Evening primrose oil is generally considered safe for most people, but it can cause side effects in some individuals, including gastrointestinal issues like heartburn. This may occur due to its oil content, which can relax the lower esophageal sphincter, allowing stomach acid to flow back into the esophagus. If you experience heartburn after taking evening primrose oil, it may be best to discontinue use and consult a healthcare professional.