I’m guessing because adults aren’t developing as rapidly as babies it would not be significant, if any benefit. But someone would need to perform a study.
hmmm, well looking at lactoferrin specifically we could flip it to say to get your iron/copper/zinc levels as an adult checked. Many of the smart geeky adults I encounter have a zinc deficiency. This often shows up as a minor eczema such as types of dyshydrosis and hidradenitis suppurativa.