Every recommendation names a molecule, a dose, and a citation. No hype. No transformation photos. No "one weird trick." Just what the data says — and what actually moves the needle after 40.
See what I actually use →Somewhere around 42, the body stops responding to what used to work. Sleep gets shallower. Belly fat stops moving. Recovery triples. Your labs come back "normal range" and your doctor tells you to exercise more.
The problem isn't effort. It's that most health content for men over 40 is either recycled bro-science or hedged medical boilerplate. Neither one tells you which magnesium form to take at bedtime, or why your testosterone looks fine but you feel flat, or which five labs your PCP didn't order.
Iron Horizon closes that gap. Every post names a molecule, a number, or a contrarian claim — and cites the source. Nothing gets recommended here that doesn't have evidence behind it and a dose that actually matters.
Every item below has a specific reason, a specific dose, and a specific research base. This page only updates when something earns its place.
Some links are affiliate links. I only link to products I've researched, would use, or do use. Commissions don't influence what's listed — they fund this project.