Magnesium for Eczema & Psoriasis: The HPA Axis Mechanism, Dead Sea Evidence & What the Research Shows
Magnesium has become one of the more widely discussed supplements in the eczema and psoriasis community — and with some reason. It's involved in hundreds of biological processes, several of which are directly relevant to inflammatory skin conditions. The Dead Sea, famous for its apparent benefits for psoriasis, is exceptionally high in magnesium salts. Epsom salt baths are a staple recommendation in natural skincare circles.
But does the evidence actually support magnesium as a useful tool for managing these conditions? And if so, in what forms, and with what realistic expectations?
Here's a clear-eyed look at what magnesium does, what the research shows, and where it sits in a broader approach to skin health.
What magnesium does in the body
Magnesium is involved in over 300 enzymatic reactions in the human body — a figure that gets cited often, but is worth unpacking in the context of skin health specifically.
The functions most relevant to eczema and psoriasis are:
Inflammation regulation. Magnesium plays a role in modulating the body's inflammatory response. Low magnesium levels are associated with elevated markers of systemic inflammation, including C-reactive protein (CRP). Since both eczema and psoriasis are driven by inflammatory immune responses, anything that influences inflammation balance is potentially relevant.
Stress response regulation. Magnesium helps regulate the hypothalamic-pituitary-adrenal (HPA) axis — the system that governs the body's response to stress. When magnesium levels are low, the stress response tends to be exaggerated, leading to higher cortisol output. Cortisol, in turn, is a well-established trigger for eczema and psoriasis flare-ups. This is one of the most direct mechanisms by which magnesium deficiency could affect skin conditions.
Sleep quality. Magnesium is involved in regulating neurotransmitters including GABA, which promotes relaxation and sleep. Poor sleep is both a consequence and a cause of eczema flare-ups — it impairs skin barrier recovery and elevates inflammatory markers. Magnesium's role in sleep quality therefore has indirect but meaningful relevance.
Skin barrier lipid production. There is some evidence that magnesium is involved in ceramide synthesis — the production of lipids that are integral to the skin barrier. A healthy skin barrier is the central issue in eczema, and ceramide deficiency is one of its hallmarks.
Immune function. Magnesium is required for normal T-cell function and immune regulation. Both eczema and psoriasis involve dysregulated immune responses — in eczema, a Th2-dominant response drives inflammation; in psoriasis, a Th17-dominant response is central. Magnesium's role in immune modulation is modest but real.
Can magnesium help eczema and psoriasis?
Magnesium may help support inflammation balance, skin barrier function, and stress regulation — but it's not a treatment for eczema or psoriasis, and the distinction between those two things is worth making clearly before going further. The case for magnesium isn't based on dramatic clinical trial evidence of plaque clearance or eczema resolution — it's based on the specific roles magnesium plays in several biological pathways that are directly relevant to both conditions: HPA axis regulation determining how severely psychological stress translates into cortisol-driven skin flares, mitochondrial energy production supporting the cellular repair processes active overnight, and anti-inflammatory immune modulation influencing the Th2 and Th17 activity driving atopic and psoriatic disease respectively. These are supporting mechanisms rather than primary therapeutic ones — which means magnesium works best as part of a comprehensive nutritional approach rather than as a standalone intervention, and understanding what it actually does is more useful than either dismissing it or overstating it.
Does magnesium actually work?
Here’s the reality:
There’s no strong evidence magnesium alone improves eczema or psoriasis
Some studies show it may help reduce inflammation markers
Topical magnesium and salt baths may help skin hydration and comfort
But results are:
inconsistent
often mild
highly individual
What the research actually shows
The evidence base for magnesium specifically in eczema and psoriasis is limited but not absent.
Several studies have found lower serum magnesium levels in people with psoriasis compared to healthy controls, suggesting a possible link between magnesium status and disease activity. Whether low magnesium contributes to psoriasis, or whether the inflammatory state of psoriasis depletes magnesium, is not yet fully established — but the association is consistent enough to be meaningful.
For eczema, the picture is more indirect. The strongest evidence comes via magnesium's role in stress and cortisol regulation. There's good evidence that stress worsens eczema, good evidence that magnesium deficiency exacerbates the stress response, and therefore a reasonable inference that adequate magnesium status may help reduce stress-related flare-ups — even if the direct eczema-magnesium research is sparse.
The Dead Sea connection is frequently cited but worth examining carefully. Dead Sea water is rich in magnesium chloride alongside many other minerals. Studies have shown genuine benefits for both eczema and psoriasis from Dead Sea bathing and Dead Sea salt products — but attributing this specifically to magnesium is difficult when multiple minerals and the UV exposure at the Dead Sea are all potentially contributing.
The honest summary: magnesium has plausible, mechanistically sound reasons to be relevant for both conditions. The direct clinical evidence is limited. The indirect evidence — via stress, sleep, inflammation, and barrier function — is more compelling.
Forms of magnesium for skin
1. Oral supplements
Oral magnesium supplementation is the most straightforward way to address magnesium status. It's the approach best supported by evidence for systemic effects — particularly stress and sleep regulation.
Not all magnesium supplements are equivalent. The form of magnesium matters for absorption. Magnesium glycinate and magnesium citrate tend to be better absorbed and gentler on digestion than magnesium oxide, which is commonly found in cheaper supplements but has poor bioavailability and is more likely to cause loose stools at higher doses.
The Drought Skin Support Formula contains magnesium as one of its 14 nutrients, specifically for its role in supporting normal physiological balance and its relevance to stress regulation — both meaningful for reactive skin. Explore the formula →
2. Magnesium baths (Epsom salts)
Epsom salt (magnesium sulphate) baths are one of the most popular home remedies for eczema and psoriasis. The idea is that magnesium is absorbed through the skin during bathing, delivering direct benefits to the skin barrier.
The evidence here is genuinely mixed. Several studies have shown that magnesium can be absorbed transdermally — through the skin — though the extent of absorption and its clinical significance is debated. What is clearer is that salt baths (including Dead Sea salt) can reduce transepidermal water loss and improve skin hydration in people with eczema.
One important caution: for some people with eczema, salt baths sting on broken or inflamed skin. Start with a lower concentration and assess your skin's response before increasing.
3. Topical magnesium (oils/creams)
Magnesium oil — which is actually a concentrated solution of magnesium chloride in water, not an oil — is applied directly to the skin. The claimed benefits include both transdermal magnesium delivery and localised anti-inflammatory effects.
A practical note for eczema-prone skin: magnesium oil can cause a tingling or stinging sensation on application, particularly on sensitive or compromised skin. This is worth testing cautiously — apply to a small, unaffected area first. Some people find it well-tolerated; others find it too irritating to use consistently on inflamed skin.
Recommended Products
Westlab Reviving Epsom Salt
a well-regarded UK option. For eczema-prone skin, using Epsom salts in lukewarm (not hot) water for 10–15 minutes, followed immediately by emollient application, is the approach most likely to be beneficial. Hot water accelerates moisture loss and can worsen symptoms — temperature matters.
BetterYou Magnesium Oil Body Spray
one of the most established products in this category. BetterYou have done their own research into transdermal magnesium absorption, though independent clinical evidence remains limited
Magnesium deficiency: how common is it?
This matters because the question of whether supplementing magnesium actually helps depends partly on whether many people with eczema and psoriasis are deficient in the first place.
Magnesium deficiency is more prevalent than commonly assumed. Estimates suggest that a significant proportion of the UK population consume less than the recommended amount (300mg per day for men, 270mg for women). Deficiency tends to be higher in people who drink alcohol regularly, who have digestive conditions affecting absorption, who take certain medications (including proton pump inhibitors and some diuretics), and whose diets are high in processed foods.
Symptoms of low magnesium include muscle cramps, poor sleep, fatigue, anxiety, and heightened stress reactivity — several of which are also common in people with chronic skin conditions, either as contributing factors or consequences. It's plausible, though not proven, that a subset of people with eczema or psoriasis have lower magnesium status that is contributing to their condition.
Dietary sources of magnesium
Before reaching for a supplement, it's worth considering whether dietary intake can be improved. Good food sources of magnesium include:
Dark leafy greens — particularly spinach and Swiss chard, which are among the richest sources. Nuts and seeds — pumpkin seeds, almonds, and cashews are particularly high. Legumes — black beans, edamame, and lentils. Wholegrains — brown rice, oats, and wholemeal bread. Dark chocolate (70% or above) — a genuine dietary source and one of the more enjoyable ones. Oily fish — salmon and mackerel contain useful amounts.
A diet regularly including these foods provides a good foundation. Supplementation becomes more relevant when dietary intake is consistently low, when absorption may be impaired, or when the stress-sleep rationale makes additional support worthwhile.
What magnesium can and can't do for eczema and psoriasis
Being direct about this matters:
Magnesium is not a treatment for eczema or psoriasis. It will not clear plaques, reliably prevent flares on its own, or act as a substitute for medical care or a comprehensive approach to skin management.
Where it has a legitimate supporting role:
As part of addressing magnesium deficiency, which may be contributing to heightened stress responses and poor sleep — both relevant triggers. As a bathing addition that may improve skin hydration and comfort. As a component of a broader nutritional approach to skin health, alongside other nutrients that play documented roles in barrier function, immune regulation, and cellular repair.
The key framing is supportive, not curative. Magnesium addresses certain pathways. It doesn't address all of them — and psoriasis and eczema involve enough overlapping systems that single-nutrient approaches consistently underperform compared to more comprehensive nutritional support.
When magnesium might help
It may be worth trying if:
you have high stress levels
your diet is low in magnesium-rich foods
you’re looking to support overall skin health
Think of it as supportive—not targeted treatment.
Skin support for eczema & psoriasis-prone skin
This is ultimately the most important point. Eczema and psoriasis are multi-system conditions. The nutrients most relevant to managing them from within include not just magnesium, but zinc, vitamin D, vitamin C, biotin, B vitamins, copper, and antioxidants like CoQ10 — each addressing different aspects of barrier function, immune regulation, and skin repair.
Magnesium is one of the 14 nutrients included in Drought's Skin Support Formula, precisely because of its role in stress regulation and physiological balance. The formula is designed to provide comprehensive nutritional support for reactive skin — covering the multiple pathways that single-ingredient supplements inevitably leave unaddressed. Made in the UK, suitable for vegetarians, and formulated for consistent daily use.
FAQs: Magnesium & skin conditions
Is magnesium good for eczema?
Indirectly rather than directly — magnesium's most relevant contributions are via HPA axis stress regulation reducing cortisol-driven Th2 amplification, sleep quality support improving the overnight barrier repair that eczema skin specifically requires, and possible support for ceramide synthesis through its role in lipid metabolism enzymes. There is limited direct clinical evidence for magnesium as an eczema treatment, but the mechanistic rationale across these three pathways is genuinely sound. Most useful as part of a comprehensive nutritional approach rather than as a standalone intervention.
Can magnesium improve psoriasis?
Several studies have found lower serum magnesium in people with psoriasis compared to healthy controls — and a 2025 NHANES analysis found that higher magnesium depletion scores were associated with increased psoriasis prevalence and all-cause mortality. Whether low magnesium contributes to psoriasis or whether psoriasis's inflammatory burden depletes magnesium is not yet fully established. Magnesium's anti-inflammatory activity through NF-κB modulation and its Th17 immune regulation role are specifically relevant to psoriasis's immune pathway — making adequate magnesium status a coherent part of comprehensive nutritional management.
Are Epsom salt baths effective for eczema and psoriasis?
They provide genuine surface benefit — magnesium sulphate reduces transepidermal water loss and improves skin hydration in eczema-prone skin, with the Dead Sea mineral bath evidence providing the most specific clinical support for salt bathing in psoriasis. The extent of transdermal magnesium absorption and its systemic significance is genuinely debated. Practical guidance: use lukewarm rather than hot water (hot water accelerates moisture loss and worsens barrier function), limit sessions to 10–15 minutes, and apply emollient immediately afterwards while skin is still slightly damp. Test cautiously on broken or inflamed skin — magnesium chloride solutions can sting on compromised eczema skin.
What form of magnesium supplement is best for eczema and psoriasis?
Magnesium glycinate and magnesium citrate have significantly better bioavailability and are gentler on digestion than magnesium oxide — which is the most common form in budget supplements but has poor absorption and causes loose stools at higher doses. Magnesium glycinate is the most appropriate form for people supplementing primarily for stress and sleep support — the glycine component has additional calming properties relevant to the HPA axis regulation that makes magnesium useful for stress-triggered eczema and psoriasis flares.
Should I take magnesium supplements for eczema or psoriasis?
Consider supplementation if dietary intake is consistently low, if you experience poor sleep, muscle cramps, fatigue, or heightened stress reactivity alongside skin symptoms, or if your diet is high in processed foods and low in dark leafy greens, nuts, seeds, and legumes. Standard supplemental doses of 200–400mg daily are appropriate — avoid very high doses without GP guidance given the laxative effect and the theoretical calcium competition at excessive intake. Testing dietary intake improvement before supplementation is reasonable for most people.
Can magnesium oil irritate eczema?
Yes — particularly on broken or actively inflamed skin. Magnesium chloride solution causes a tingling or stinging sensation on sensitised or compromised skin that most people with active eczema find too irritating to use consistently. Test on a small unaffected area before applying to inflamed eczema-prone skin — and use only during periods of settled, non-inflamed skin. Epsom salt baths at lower concentrations are generally better tolerated on eczema-prone skin than topical magnesium oil applied directly.
How does magnesium affect the stress-eczema and stress-psoriasis connection?
Magnesium regulates the hypothalamic-pituitary-adrenal axis — the system governing the body's stress response. When magnesium levels are low, the HPA axis produces an exaggerated cortisol response to the same stressor. Elevated cortisol depletes ceramide synthesis, amplifies Th2 immune activity in eczema, and worsens the inflammatory cytokine environment in psoriasis — driving the stress-triggered flares that both conditions are prone to. Adequate magnesium status doesn't eliminate stress-triggered flares but reduces the amplitude of the cortisol response that drives them — making it the most specifically relevant nutritional intervention for the stress dimension of both conditions.
Summary
Magnesium supports eczema and psoriasis management through stress regulation, mitochondrial energy, and anti-inflammatory immune modulation — with additional surface benefit from bathing preparations. It doesn't treat either condition directly and shouldn't be positioned as a primary intervention. Where it earns its place is as one component of a comprehensive nutritional approach — addressing the HPA axis, cortisol, and cellular energy dimensions that no topical treatment reaches, alongside the other nutrients that cover barrier function, immune regulation, and skin repair simultaneously.
Written by the Drought Skin team — specialists in natural support for psoriasis, eczema, and sensitive skin.
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