It's not only the chitin that causes nausea/cramping/stomach upset. It's also the binding of the triptamine of your choice that you just flooded your body with

It's not only the chitin that causes nausea/cramping/stomach upset. It's also the binding of the triptamine of your choice that you just flooded your body with to the many serotonin receptors in your gut. Techniques like lemon-tek or other filtering methods to remove chitin can help at reducing nausea, but it's only one factor.