Epsom salt has not been shown to treat or reverse hair loss. No clinical trials in humans have found that applying magnesium sulfate (the chemical name for Epsom salt) to the scalp promotes hair regrowth or slows thinning. While magnesium plays a role in hundreds of processes in the body, soaking your scalp in it is a very different thing from getting enough of it internally.
What the Research Actually Shows
The appeal of Epsom salt for hair loss rests on a simple idea: magnesium is important for cell function, hair follicles need healthy cells, so bathing your scalp in magnesium should help. The problem is that magnesium ions don’t pass through skin easily. A 2017 review in the journal Nutrients found that magnesium in solution is in ionized form and struggles to cross the skin’s outer barrier, which is designed to keep things out. The hydrated magnesium ion is roughly 400 times larger than its dehydrated form, making it nearly impossible for it to slip through cell membranes on its own. Living cells use specialized transporter proteins to pull magnesium inside, but the dead cells in your skin’s outer layer don’t have functioning versions of these transporters.
Hair follicles and sweat glands do offer a small bypass route. One study found that magnesium ions can penetrate the outer skin layer in a way that depends on concentration and time, and hair follicles significantly helped that process. But those openings make up only 0.1% to 1% of the skin’s surface. In a randomized, placebo-controlled trial of 34 healthy volunteers, repeated application of a magnesium-rich lotion produced no significant difference in blood magnesium levels compared to placebo. The review’s authors concluded they “cannot yet recommend the application of transdermal magnesium.”
As for direct evidence on hair regrowth, a randomized clinical trial published in Reproductive Biology and Endocrinology gave oral magnesium supplements to women with polycystic ovary syndrome and tracked their alopecia scores over the study period. Both the magnesium group and the placebo group saw identical improvements in hair loss scores, with no statistically significant difference between them (p = 0.958). The study’s own conclusion: magnesium supplementation had no significant effect on alopecia. One mouse study did find topical magnesium promoted regrowth of shed hair, but animal results frequently don’t translate to humans.
The Magnesium-Hair Loss Connection
There is one genuinely interesting thread in the research. Magnesium deficiency may be more common in people experiencing unexplained hair shedding. A study by Tataru and Nicoara examined three groups of women aged 16 to 40: those with unexplained diffuse hair loss, those with hair loss from known causes (hormonal issues, thyroid disease), and a control group with no hair loss. Among women with unexplained shedding, 46% had low magnesium levels, compared to 21% in the known-cause group and just 8% in the control group.
That’s a striking difference, but it doesn’t mean rubbing Epsom salt on your head fixes the problem. If low magnesium contributes to hair shedding, the deficiency is systemic, meaning it affects your whole body. Addressing it would require improving your diet or taking an oral supplement, not applying a topical paste. Good dietary sources of magnesium include pumpkin seeds, almonds, spinach, black beans, and dark chocolate.
What Epsom Salt Can Do for Your Scalp
Epsom salt does work as a physical exfoliant. The granules scrub away dead skin cells, excess oil, and product buildup. If your scalp feels heavy with residue from styling products or if you deal with oily roots, an occasional Epsom salt scrub can leave your scalp feeling cleaner. A cleaner scalp isn’t a cure for hair loss, but removing buildup that clogs follicles can support a healthier environment for the hair you do have.
To try it, mix equal parts Epsom salt with a dollop of your regular shampoo and massage it into your scalp before rinsing. You can also add about two tablespoons per 16 ounces of shampoo for a premixed version. For dry hair, mix equal parts with conditioner, leave it on for about 20 minutes, then rinse. Either way, limit use to every other wash at most.
Risks of Overuse
Epsom salt strips natural oils from your hair and scalp. Used too often, it can leave strands feeling rough, dry, and brittle. The coarse granules can also create tiny tears in the hair cuticle, weakening the shaft and making breakage more likely. That’s the opposite of what you want if you’re already worried about thinning.
Your scalp maintains a specific pH balance, and salt can disrupt it. When that happens, some people experience redness, itching, flakiness, or a rebound in oil production as the scalp tries to compensate. If your skin is sensitive or you have any active irritation, salt scrubs will likely make things worse.
Why the Popularity Outpaces the Evidence
Epsom salt is cheap, widely available, and has a long folk reputation for healing. People feel a difference when they use it: their scalp feels tingly, their hair looks temporarily fuller after the exfoliation removes oil and product weight. That immediate sensory feedback is convincing, even though it has nothing to do with follicle regeneration or reversing miniaturization, which is the actual process behind most hair loss.
The most common types of hair loss, androgenetic alopecia (pattern baldness) in both men and women and telogen effluvium (stress-related shedding), involve hormonal signaling, genetics, and systemic health factors that a topical salt soak simply cannot reach. If you’re experiencing noticeable thinning, the time and money spent on Epsom salt rinses would be better directed toward identifying the underlying cause, whether that’s hormonal, nutritional, or stress-related.