It means that it does not cause damage, which does not produce negative effects. Harmless, innocent, inert, innocuous, inactive, anodyne.
food to be eaten or prepared according to sanitary toilet, no rules you will harm the health consumer.
It is something that does not damage the immune system of the man.Example: do objects: materials q do not cause damage to the persona.¿comestible: food ready for consumption without causing disease and healthy?