The front of a packet is designed to communicate quickly. It may not answer every question you have about animal ingredients, allergens, or how the product was made.
Read the ingredient list and any relevant certification or precautionary information. A vegan label can be useful, but it does not automatically mean a product is suitable for a milk allergy or another medical requirement.
Check familiar products again when buying, since formulations can change. Sauces, breads, flavored snacks, and desserts are worth particular attention because their appearance gives few clues about every ingredient.
If information is unclear, contact the manufacturer or choose something whose ingredients you can establish. You do not have to become an expert in every additive before cooking dinner, but you should avoid turning a reassuring word on the front into a guarantee it was not intended to provide.