Epsom Salt Baths: Comforting, Yes; Magnesium Absorption, Doubtful

Epsom salts are magnesium sulfate. People add them to warm bath water because they like the feeling of a soak. Much of the comfort comes from the warmth itself. Many people find heat eases stiffness for a while, and a slow, quiet bath can ease tension.

• The magnesium claim is not supported. There isn't strong research on Epsom salt baths specifically, and we found nothing showing they raise magnesium levels in the body in a meaningful way. The claim deserves caution.
• Remedies often lack strong evidence. The NCCIH notes that evidence for many supplements is insufficient for musculoskeletal pain [R20]. Epsom salts are not a supplement, so this is the closest evidence, and it only suggests caution.
• Most shoulder pain is managed with advice and exercise. In primary care, most shoulder pain is managed with advice and exercise. Acute, severe pain after an injury needs proper diagnosis [R30].

1. Enjoy a warm bath or shower if it feels good. Keep the water comfortably warm rather than hot, and get out slowly.
2. Use a shower chair if standing is hard. A sturdy seat with a non-slip base keeps the bath safe and restful.
3. Try a seated warm compress. Sit in a comfortable chair with a warm, damp towel draped over the shoulder for a few minutes.
4. Do not drink or swallow bath salts. Use them only in the bath.
5. Pair warmth with gentle movement you have been cleared to do. Some people like warmth before moving, as a comfort habit, not a remedy.
6. Keep notes. If the bath does not help, or pain keeps returning, share that with your clinician.