Magnesium Sprays vs Baths: Which helps you sleep better?

Magnesium sprays and Epsom salt baths are everywhere in the sleep world—but are they actually doing what people claim?

In this episode, we strip it down to mechanisms.
 No fluff. No marketing.

You’ll learn:
 – Why Epsom salt baths feel so effective (and what’s really behind it)
 – The truth about magnesium absorption through the skin
 – Why sprays may “work” without actually delivering magnesium
 – A simple DIY magnesium spray (no unnecessary additives)
 – Where citric acid fits in—and why you can skip it

If you’re using these tools, this episode will recalibrate how you think about them—and help you use them more intentionally.

Transcript

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Welcome back to Night Shift with Justin S. King, how to transform your life one night at a time. Tonight we're talking about magnesium again because magnesium has become one of those sleep cure buzzwords. Supplements, sprays, baths, oils. But if you strip away all the marketing, the real question is simple: does it work? We've covered Epsom salt baths before. People swear by them for relaxation, muscle relief, and better sleep. And something is happening that helps you sleep. When you get in a warm bath, two things kick in immediately. First, heat and warm water increases circulation and helps muscle relax. And second, the buoyancy of the salt is your body literally is unloaded and less pressure on joints, tension in the system. So that alone can make you feel lighter, looser, and calmer, less pressure on your joints. But there's no strong evidence that magnesium from Epsom salt is actually being absorbed through your skin in any meaningful way. So if you feel better after a bath, it's likely the heat and the environment, not the magnesium. And let's shift to magnesium sprays because that is another buzz word product out there. First off, your skin is designed to keep things out. Magnesium is an ion, it doesn't easily pass through the skin barrier, which makes again absorption at best minimal. There's no measurable absorption in studies that I've found. So here's three reasons why magnesium spray may work. One is ritual, you're slowing down, applying something intentionally before bed. Two, there's a placebo effect. Exception changes perception. That's real. You're told it will work and it does. And sensation, the spray can feel slightly cooling as it evaporates. Particularly the magnesium chloride may give you a tingling sensation. So that cooling effect might help you feel more relaxed, but there's no meaningful drop in core body temperature. If you are interested in using a spray for magnesium, a magnesium spray to help your sleep, I would recommend doing a DIY version, making one yourself with a glass spray bottle. You're going to want to get magnesium chloride flakes, distilled water, and about a one-to-one ratio. Warm the water, dissolve it, and done that's your magnesium spray. If you're looking at other popular magnesium sprays on the market, they will also have Epsom salt in them and citric acid. So if you want to add Epsom salt for kicks of it, you can do that. Importantly, you do not need citric acid while it supposedly helps your pH balance. It's mainly there for commercial products as shelf stability. If you're not aware, most citric acid that is commercially used is produced through black mold fermentation process. The final product is purified, so it's not contaminated. But if that bothers you, just leave it out and you may look at those purchase menu sprays that have citric acid in it a little bit differently from now on. So for a short-term DIY spray, you don't need the citric acid. Just to recap, epsisol baths are helpful because of the heat and the buoyancy. Magnesium sprays are potentially helpful because of ritual and perception, not specifically absorption of magnesium. If your goal is better sleep, don't rely on either of those as your primary fallback on what matters such as sleep timing, light exposure, caffeine control, and a nightly round down. A night if you'd like a evening routine that can help you fall asleep fast and stay asleep in as little as three days, head over to my website, JustinSKing.com slash fast. And for tonight's shift, if you're using a spray or a bath, keep it, but change how you think about it. Use it as a signal to your body that the day is over. And if you're going to use magnesium spray, why not make your own? That's it for tonight's episode of Night Shift. My name is Justin S. King, and I help entrepreneurs find peace tonight, tomorrow, and for the rest of their lives through sleep optimization, emotion regulation, and discovering their purpose. Good night.