Salutary (adjective)

1. Tending to promote physical or moral well-being.
2. Having a beneficial effect.

Origin:

From latin salutaris ("healthful, wholesome"), from salus ("healt.h")

Examples:

1. The fresh air and exercise had a salutary effect on her health.
2. The new law had a salutary effect on reducing crime.
3. The change in diet had a salutary effect on her cholesterol levels.
4. The salutary effects of the therapy became apparent over time.
5. The salutary influence of his mentor helped shape his future.