Epsom Salt
Epsom salt (magnesium sulfate): what a review found about transdermal magnesium (unsupported), how it differs from a magnesium supplement, and where proper evidence was not found.
Content last updated . This page has not been medically reviewed.
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Overview and identity
Epsom salt is magnesium sulfate. Magnesium's main guide is under Vitamins & Supplements; this page is about Epsom salt as a bath or topical product. It is not a magnesium supplement, and we do not claim its effects are equivalent to oral magnesium.Does magnesium absorb through the skin?
A 2017 review evaluated the literature and evidence-based data on transdermal magnesium (magnesium sprays, flakes and salt baths) and concluded that the propagation of transdermal magnesium is scientifically unsupported. It notes that oral magnesium supplementation is well documented for magnesium deficiency, and that marketing for skin application has claimed better absorption and fewer side effects. [1]Other uses
Proper evidence not found (in sources we could read) for Epsom salt baths relieving sore muscles, constipation, or stress, for safe amounts, or for safety with medicines or kidney disease. Many search results claim these benefits; we did not find a source we could read that supports them. Oral magnesium sulfate is a medicine with its own risks; we do not recommend swallowing Epsom salt, and the sources we read do not address that use.Safety
For use as directed on a product made for the purpose. Do not swallow bath products. If you have kidney disease or take medicine, ask a pharmacist before using magnesium products.Frequently asked questions
Does Epsom salt give you magnesium through your skin?
A 2017 review concluded that transdermal magnesium claims are scientifically unsupported. [1]
Does Epsom salt help sore muscles?
We found no source we could read that supports it.
References
- Grober U, Werner T, Vormann J, Kisters K. Myth or Reality: Transdermal Magnesium?. Nutrients. 2017;9(8):813. PubMed 28788060.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.