A: Thank you for your question. According to the blender, there is no shell fish product in our fertilizer. However, we can not guarantee that some wouldn’t, inadvertently, get into the blending process. We have not tested the percentage of fertilizer that can be absorbed into the fruit. Liquinox suggests that if a customer is allergic to shell fish, they should not use Liquinox Fish to fertilizer their fruit trees. Maybe suggest the customer use Liquinox Grow. It’s better to error on the safe side.