Walk down any wellness aisle and you'll be told that magnesium soaks into your body through your skin while you bathe, topping up a mineral most of us are short on. It's a lovely story. It's also mostly not true.
The evidence for meaningful transdermal magnesium absorption — magnesium crossing the skin barrier in amounts that matter — is thin. Your skin is very good at keeping things out. So we're not going to pretend a 20-minute bath is quietly fixing your magnesium levels.
So why does the bath work?
Because of the heat, not the mineral. A hot bath raises your core temperature; the rapid cool-down afterwards is the real, well-documented trigger for sleep onset. The magnesium is a pleasant bonus — it's not the mechanism.
We think being honest about this is the whole point. When a brand leads with a claim the science doesn't back, you should trust everything else it says a little less. We'd rather tell you exactly why the ritual works, put it on the label, and let the results speak.