murphyMagnesium Salicylate
AKA: 18917-89-0, Magnesium salicylate anhydrous, Magnesium disalicylate, Backache relief, Bayer Select Backache
Synthetic
Preservative
Not Clean
OriginMagnesium salicylate is synthesized from salicylic acid and magnesium compounds within the synthetic chemical family. It is produced through acid-base neutralization reactions combining salicylic acid with magnesium hydroxide or magnesium oxide.
Magnesium salicylate is a non-steroidal anti-inflammatory drug (NSAID) used to treat mild to moderate pain. It is available in several over-the-counter (OTC) formulations. Though the recommended doseage is 1160 mg every six hours, per package directions of the Doan's OTC brand (580 mg magnesium salicylate tetrahydrate, equivalent to 934.4 mg anhydrous magnesium salicylate), effective pain relief is often found with a half dosage, with reduced anti-inflammatory results.
Formula
C14H10MgO6
Mol. Weight
298.53
CAS #
18917-89-0
Form
Powder
State
Solid
Skin Types
●all-skin-types
Best For
Acne
Pregnancy & Breastfeeding Safe
Caution
Functions
Preservative
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Quells irritation
Reduces redness
Reduces swelling
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
3
CIR
Safe as used
Pregnancy
Caution
Concentration Guide
Leave-on0.2%
Rinse-offNot reported
0%50%100%
Reg. limit 0.5%
CIR reported use · 2018 survey
EU regulatory limit: 0.5%. Not to be used for children under 3 years of age (2) Source: EU Cosmetics Regulation (EC) 1223/2009, Annex V (Preservatives), Entry 3.
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR