However, some of them may have more or less evidence for beneficial effects in normal people as well.
That could indeed be evidence of a significant beneficial effect.
Their time away from the wilderness had a beneficial effect.
Plants may also have beneficial effects upon one another, but this is less common.
I think Earth has had a beneficial effect upon you.
This has a beneficial effect on the health of the physical body.
He also takes on board the rise of the internet and its beneficial effect.
The two men feel that they have had a beneficial effect on one another.
"What we do in this office can have a beneficial effect on millions of people."
Wine does have a beneficial effect on health, and should be considered as a food.