"Help yourself" is an expression that is commonly used to encourage someone to take whatever they need or want without needing to ask permission. Other phrases that can be used as synonyms for "help yourself" include "go ahead," "take what you like," "grab a bite," "don't be shy," "have at it," and "make yourself at home." Each of these phrases conveys a similar message to "help yourself" and can be used in a variety of situations, including when hosting a party, offering food or drink to guests, or simply giving someone permission to take or use something.