Mostly it will be out of date. The only possible use it might have is to revive thought on possible good supplements of the past that are legit but fell out of popular favor. I’ve been reading books on vitamins and supplements for a long time and I think some real gems get lost along the way. Like I still think R-Alpha Lipoic Acid should be the flagship of everyone’s supplement regime, but it seems these days no one talks about it.