beneficial and harmless; good with no drawbacks
Describes something that is entirely positive, with no negative side effects. Often used in formal or written contexts to emphasize safety and benefit.
This supplement is advertised as beneficial and harmless.
His proposal was something beneficial and harmless.
Means 'harmless' alone, without the 'beneficial' nuance. 有益無害 explicitly adds the idea of being beneficial.
Means 'beneficial' or 'useful', but does not inherently imply harmlessness. 有益無害 combines both concepts.
A four-character compound (yojijukugo) combining 有益 (beneficial) and 無害 (harmless). The exact origin is uncertain, but it follows a common pattern of pairing positive and negative terms to express a complete idea.