Can saffron and cassia seeds be steeped together in water for drinking?
Generally, saffron and cassia seeds can be steeped together in water for drinking, but it is not recommended to consume this infusion frequently. The detailed analysis is as follows:

Saffron and cassia seeds have no conflicting components, and when combined, their effects can complement each other. Saffron is neutral in nature and helps soothe emotions, while cassia seeds have a sweet, bitter, and slightly salty taste, known for clearing the liver and improving eyesight. When steeped together, their active ingredients dissolve harmoniously in water, without generating harmful substances, enhancing both flavor and therapeutic benefits. This combination is suitable for moderate daily consumption, especially beneficial for individuals seeking emotional relaxation and eye health support.
The amount of saffron should be very small—only 3 to 5 threads per serving—while cassia seeds can be used in amounts of 5 to 10 grams per serving; excessive use may cause bodily discomfort. Rinse briefly with warm water before brewing to remove surface dust. Individuals with cold body constitution or those prone to diarrhea should halve the amount of cassia seeds and avoid long-term continuous consumption. Store each ingredient separately in sealed containers in a cool, dry place to prevent moisture, spoilage, or loss of aroma. If gastrointestinal discomfort occurs after consumption, discontinue use immediately to ensure safety.