First of all, take a close look at the list of ingredients. The shorter the list of ingredients, the better.
Not a must, but definitely a plus is if the product is organic and / or contains raw ingredients.
This means there are no unwanted substances that could harm your health. And the more natural ingredients there are, the higher the health benefits.
With regard to intolerance or allergies, always look if the bars contain nuts or allergens.
Again, it is important that you take a close look at what the protein bars contain because there may be some chemical-looking names that aren't as bad as they sound.
If necessary, contact the manufacturer.