Disney says
Nondairy Lemon Soft-serve topped with White Chocolate.
Friendliest.app says
It's snow-capped lemon is free of gluten/wheat, fish, shellfish, peanuts, eggs and soy.

This meal contains milk and tree nuts. It also contains wheat/gluten in ordered in a cone instead of a cup.

For a milk-friendly option, It's Lemon can be ordered without the white chocolate topping.

Notes: We do not consider this meal tree nut-friendly due to the presence of coconut oil in the lemon soft serve. The FDA classifies coconut as a tree nut, though many individuals with tree nut allergies do not have a reaction to coconut.

If you have a gluten allergy you may want to ask the cast member to switch gloves and wipe surfaces to reduce cross contamination risks from the cones.