Epsom Salt vs Kosher Salt (Diamond Crystal): Which Salt Is Better?
Choosing between Epsom Salt and Kosher Salt (Diamond Crystal) depends on your cooking style, flavor preferences, and intended use. This comparison breaks down every difference so you can make an informed decision. We analyze origin, mineral content, taste profile, grain options, price, and best applications for each salt.
Side-by-Side Comparison
| Feature | Epsom Salt | Kosher Salt (Diamond Crystal) |
|---|---|---|
| Origin | Originally from Epsom, Surrey, England; now manufactured worldwide | United States |
| Color | White, translucent crystals | White |
| Type | Magnesium sulfate heptahydrate (not sodium chloride) | Evaporated kosher-certified salt with hollow flake crystals |
| Harvest Method | Synthesized from magnesium, sulfur, and oxygen or mined from natural deposits | Evaporation process producing distinctive hollow, flat crystal flakes |
| Taste | Extremely bitter. Not used as a food seasoning. | Pure, clean salt flavor. No bitterness, no metallic notes. The hollow crystals dissolve quickly and evenly. |
| Grain Sizes | Fine, Medium crystals, Coarse crystals | Coarse hollow flakes |
| Price Range | $1-5 per pound | $3-6 per pound |
| Best For | Bath soaks for muscle relief, Garden fertilizer, Foot soaks, Beauty treatments, Constipation relief (medical grade only) | Dry brining, General cooking, Seasoning meats, Pasta water, Baking (by weight) |
| Trace Minerals | 3+ | 5+ |
| Sodium (g/100g) | N/A | 38 |
Key Differences
Origin & Harvesting
Epsom Salt comes from Originally from Epsom, Surrey, England; now manufactured worldwide and is synthesized from magnesium, sulfur, and oxygen or mined from natural deposits. Kosher Salt (Diamond Crystal) originates from United States and is evaporation process producing distinctive hollow, flat crystal flakes.
Taste Profile
Epsom Salt: Extremely bitter. Not used as a food seasoning. Kosher Salt (Diamond Crystal): Pure, clean salt flavor. No bitterness, no metallic notes. The hollow crystals dissolve quickly and evenly.
Price Comparison
Epsom Salt typically costs $1-5 per pound, while Kosher Salt (Diamond Crystal) ranges $3-6 per pound.
About Epsom Salt
In 1618, a farmer in Epsom, England discovered that his cows refused to drink from a certain mineral spring. The bitter water was found to have healing properties and Epsom became a spa town. The mineral was identified as magnesium sulfate and named after the town.
Best for: Bath soaks for muscle relief, Garden fertilizer, Foot soaks, Beauty treatments, Constipation relief (medical grade only).
Read full Epsom Salt guide →About Kosher Salt (Diamond Crystal)
Diamond Crystal was founded in 1886 in St. Clair, Michigan, using a patented process called the Alberger process that creates uniquely hollow, multi-layered flake crystals by evaporating saturated brine on heated rollers. The name referred to the diamond-like clarity of the crystals. The company became the dominant American kosher salt brand and remains so, with professional chefs across North America almost universally specifying Diamond Crystal by name in cookbooks and recipes.
Best for: Dry brining, General cooking, Seasoning meats, Pasta water, Baking (by weight).
Read full Kosher Salt (Diamond Crystal) guide →Which Should You Buy?
Choose Epsom Salt if:
- +You need it for bath soaks for muscle relief
- +You need it for garden fertilizer
- +You need it for foot soaks
- +You prefer extremely bitter
Choose Kosher Salt (Diamond Crystal) if:
- +You need it for dry brining
- +You need it for general cooking
- +You need it for seasoning meats
- +You prefer pure, clean salt flavor