Can you eat grapefruit seeds?
Generally, grapefruit seeds are edible. They are safe to consume and contain nutritional components when properly processed. However, raw or spoiled seeds are not recommended for direct consumption. If in doubt, it is advisable to process them correctly before eating. Detailed analysis is as follows:

Grapefruit seeds contain nutrients such as fat and protein and are not toxic. After drying and grinding into powder, they can be added to beverages or food, or consumed after being cooked. With a soft, starchy texture, they provide certain nutritional benefits and represent a common way of utilizing this ingredient.
However, raw grapefruit seeds are hard in texture, and their outer shells contain coarse fiber. Direct consumption may lead to indigestion and gastrointestinal irritation, potentially causing discomfort such as bloating or abdominal pain. Moreover, moldy or spoiled grapefruit seeds may harbor bacteria, posing health risks if consumed, and should be discarded immediately—do not eat them under any circumstances.
Before consumption, grapefruit seeds should be thoroughly washed to remove impurities. Raw seeds must be processed—such as by grinding or cooking—and should never be eaten directly.