Almost all of the meal delivery services take allergies and diets very seriously. Whole meal plans are geared toward gluten-free, vegetarian, or even paleo.
Depending on whether your concern is dietary or for allergy reasons, be sure to check the specifics. For example, many services claim products are “no gluten added,” essentially meaning this is a dietary choice. When products are certified gluten-free, you can be sure there are only trace amounts of gluten and no cross-contamination has occurred.
Please note, there are whole services that will not certify anything to be free of allergies. While this may not be a problem for most people, this is a critical option when choosing what service works for you.