Salutary
Part of speech: adjective
Definition: Effecting or designed to effect an improvement; remedial: salutary advice. Promoting good health; wholesome; curative.
Beneficial
Part of speech: adjective
Definition: Helpful or good to something or someone.
Example sentence: I shall endeavour still further to prosecute this inquiry, an inquiry I trust not merely speculative, but of sufficient moment to inspire the pleasing hope of its becoming essentially beneficial to mankind.