Epsom Salt (Magnesium Sulfate Hyptahydrate)
Updated: Jun 10
Common Names
Epsom Salt, Magnesium Sulfate ⁽¹⁾
INCI Name
Magnesium Sulfate ⁽¹⁾
Method of
Extraction
Evaporation
Therapeutic Properties
Anti-inflammatory ⁽²⁾
Physical Properties & Energetics
Colour: White or transparent ⁽³⁾
Texture: Granular to Fine ⁽³⁾
Odour: Odourless ⁽³⁾
Energetics: Warming, when used in a warm or hot bath
Safety & Ratings
EWG Rating: 1 ⁽⁴⁾
Shelf Life: Indefinite shelf life, provided it is stored in a cool, dry location within a sealed container. ⁽⁵⁾
Important Safety Notes ⁽²⁾
Kidney Disease: Consult a doctor before use, as compromised kidneys may struggle to filter excess magnesium, leading to buildup.
Heart Conditions: Those with heart failure or severe cardiovascular issues should seek advice, as heat and magnesium absorption can alter blood pressure and strain the heart.
Low Blood Pressure: Avoid if blood pressure is uncontrolled, since warm baths can cause dizziness by widening blood vessels.
Broken Skin: Do not use on open wounds, burns, or active infections, as the solution will irritate damaged tissue.
Pregnancy: Keep water temperature below 39°C (102°F) and consult a midwife, particularly in the first trimester or for high-risk pregnancies.
Diabetes & Neuropathy: Use extreme caution; reduced sensation in the feet and legs increases the risk of burning from hot water.
Children: Only use under direct medical supervision.
Patch Test Note:
While Epsom salt is generally safe for topical use, a patch test is recommended, especially for those with sensitive skin or open wounds. Dissolve a small amount of salt in warm water and apply the solution to a small area of skin (such as the inner forearm). Alternatively, for scrub use, mix a pinch of salt with a carrier oil and apply. Observe for 24 hours, monitoring for any stinging, redness, irritation, or dryness. If any of these occur, discontinue use or dilute further.
Method of Application: Topical use only
Product Formulation
Amount to Use in Products: 1 - 100%
Uses: Baths, Scrubs, Compress, Spot Treatments
Best For
Skin Type: All skin types
Concerns: Muscle Pain, Joint Pain, Acne, Psoriasis, Eczema
Pharmacology & Research Studies
Acne & Skin Health
Beyond its traditional use in bathwater for muscle relief, Epsom salt has gained attention for topical applications. When mixed with water or a carrier oil like coconut or olive, the crystals form a gentle scrub that removes dead skin cells, leaving the complexion smoother and more radiant. ⁽⁸⁾ This mechanical exfoliation may also help unclog pores and manage acne breakouts. ⁽⁸⁾ For inflammatory skin conditions like psoriasis and eczema, the magnesium sulfate content may soothe irritation and lessen pruritus, though clinical evidence remains limited. ⁽⁸⁾
Arthritis & Inflammatory Conditions
A 2025 randomized controlled trial examined 64 adult patients with knee osteoarthritis, finding that those who used Epsom salt baths for seven days experienced significant reductions in pain and improved function in daily living compared to the control group receiving standard care. ⁽⁶⁾ Another study on arthritic patients similarly reported reductions in pain, discomfort, and joint stiffness. ⁽⁷⁾ Furthermore, when applied as a fomentation, Epsom salt has been shown to reduce knee swelling and alleviate joint pain. ⁽⁸⁾
A small 2004 study involving 19 participants showed that blood levels of magnesium and sulfate increased after taking a bath. ⁽⁷⁾ Due to its anti-inflammatory properties, Epsom salts may help reduce inflammation, ease muscle aches and pains, and relieve muscle cramping. ⁽⁷⁾
Sleep & Stress Aid
Research from a 2019 meta-analysis of 13 trials confirms that warm baths significantly shorten the time to fall asleep and improve overall rest. ⁽²⁾ This effect is driven by the body's cooling process after heat exposure, which signals the brain to initiate sleep. ⁽²⁾ While the study focused on temperature, adding Epsom salts introduces a potential, though unproven, secondary factor: magnesium. ⁽²⁾ Since magnesium is known to naturally dampen stress hormones like cortisol and support calming neurotransmitters, it is hypothesized that soaking could amplify relaxation. ⁽²⁾ However, because it is not yet confirmed if enough magnesium enters the bloodstream through the skin to cause these specific neurological shifts, the primary sleep benefit likely remains the thermal regulation, with the minerals serving as a possible complementary aid. ⁽²⁾
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Disclaimer:
The information provided in this monograph series is for educational and informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Traditional medicine systems such as TCM and Ayurveda are presented as cultural and historical frameworks, not as substitutes for evidence-based medical care.
Topical & Skincare Warning: Individual skin reactions to herbs, carrier oils, and essential oils can vary significantly. Always perform a patch test before full application and discontinue use immediately if redness, itching, burning, or swelling occurs. Do not ingest topical oils unless explicitly stated as safe for internal use. Consult a qualified healthcare provider or dermatologist before use if you are pregnant, nursing, taking medications, or managing a skin condition. Do not disregard professional medical advice or delay seeking it based on information contained here.
References:
Magnesium sulfate (MgSO₄): Cosmetic ingredient inci [Internet]. [cited 2026 May 21]. Available from: https://www.specialchem.com/cosmetics/inci-ingredients/magnesium-sulfate
Epsom Salt Bath benefits: A physio’s recovery guide: Ck physio [Internet]. 2026 [cited 2026 May 20]. Available from: https://ckphysio.co.uk/blog/epsom-salt-everyday-life
Epsom Salt [Internet]. [cited 2026 May 20]. Available from: https://www.newdirectionsaromatics.ca/spa/salts-muds-seaweed/epsom-salt?srsltid=AfmBOorqtsba5oTJ1Xuvc0bVyVdPLlm5s42xv-RvSNGxK6cqLQiT2qkH
EWG skin deep® | what is magnesium(ii), sulfate, heptahydrate [Internet]. [cited 2026 May 21]. Available from: https://www.ewg.org/skindeep/ingredients/755816-MAGNESIUMII_SULFATE_HEPTAHYDRATE/
Does epsom salt expire? what you need to know about storage and shelf life [Internet]. [cited 2026 May 20]. Available from: https://www.vitarx.co/resources/fitness-energy/does-epsom-salt-expire
Kumar V, Shyoran R, Pareek B, Pathania R, Ranaut R, Ravi RK. Exploring the therapeutic potential of Epsom Salt Bath on pain and intensity of knee osteoarthritis: Randomized controlled trial. Journal of Education and Health Promotion. 2025 Oct;14(1). doi:10.4103/jehp.jehp_2165_24
Brusie, C. (2021, June 4). What are the benefits of an epsom salt detox?. Healthline. https://www.healthline.com/health/epsom-salt-detox#benefits
Vats, S., Lakshyashree, Khan, N., & Jain, M. (2024). Journal of Clinical and Diagnostic Research, 18(9), KE01-KE03. https://www.jcdr.net/articles/PDF/19979/72825_CE%5BRa1%5D_F(SHU)_PF1(AG_SL)_PFA(KM)_PB(AG_OM)_PN(OM).pdf
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