Epsom Salt (Magnesium Sulfate) | Organic & USP Grade

• No special PPE required for normal bath and personal care use
• For bulk handling or garden mixing, wear gloves to prevent minor skin drying from prolonged contact
• Avoid inhaling dust when pouring large quantities — use in a well-ventilated area
• Wash hands thoroughly after handling for garden applications

• Store in a cool, dry location in the original sealed container
• Magnesium sulfate is hygroscopic — it absorbs moisture from the air, which can cause clumping. An airtight container prevents this
• Keep away from direct sunlight and heat sources
• Keep out of reach of children and pets
• Shelf life is indefinite when stored properly — does not expire

• This product is intended for external use only (baths, soaks, scrubs) and garden applications — it is not intended for oral consumption
• If you have a medical condition, are pregnant, nursing, or taking medications, consult your healthcare provider before use
• For garden use, do not over-apply — excess magnesium sulfate can interfere with calcium uptake and harm plants
• Test bath water temperature before entering — aim for 98–102°F for comfortable soaking
• Discontinue use if skin irritation occurs

• Eye contact: Flush with clean water for 15 minutes. Seek medical attention if irritation persists
• Skin contact: Rinse affected area with water. Generally well-tolerated; discontinue if irritation occurs
• Ingestion: Do not induce vomiting. Contact Poison Control (1-800-222-1222) or seek medical attention
• Inhalation: Move to fresh air. Seek medical attention if symptoms persist

Refer to the Safety Data Sheet (SDS) for complete safety information.

For a standard bathtub (approximately 40 gallons), use 2 cups (about 400g) of Epsom salt. Add it while the water is running for best dissolution. For a large garden tub (60+ gallons), use 3 cups. For a lighter soak, 1.5 cups works well. See our complete guide: How to Bathe in Epsom Salt.

Many people enjoy Epsom salt baths 2–3 times per week as part of their self-care routine. There's no strict limit for healthy adults using it externally. If you have any medical conditions or skin sensitivities, check with your healthcare provider for personalized guidance.

Yes. Our Epsom salt is sourced from the United States and packaged at our FDA-registered facility in Madera, California. Every batch is third-party lab tested for purity and heavy metal content before it ships.

No. Magnesium sulfate is a stable mineral compound that does not expire. Store it in a cool, dry place in an airtight container to prevent moisture absorption and clumping — but it won't lose effectiveness over time.

They are completely different compounds. Epsom salt is magnesium sulfate (MgSO₄·7H₂O), while table salt is sodium chloride (NaCl). Epsom salt contains magnesium and sulfur; table salt contains sodium and chlorine. They cannot be substituted for each other in any use case.

Yes — this is a popular and easy way to customize your bath experience. Add the essential oil after you've entered the tub for best aroma. Popular choices include Lavender (10–15 drops for relaxation), Peppermint (5–8 drops for cooling), and Eucalyptus (8–12 drops for a spa feel).

No. Our Epsom salt dissolves completely in bath water and is safe for standard plumbing and septic systems when used as directed. It's also biodegradable and environmentally benign at normal bath-use concentrations.

Yes, when used appropriately. Epsom salt delivers magnesium and sulfur — two plant nutrients — and works well for plants showing signs of magnesium deficiency. However, only apply it when there's a genuine deficiency. Excess magnesium can interfere with calcium uptake. See our full gardening tips in the Garden & Plant Care section, and our article on 8 Useful Epsom Salt Hacks for more ideas.

Our USP Grade Epsom salt is pure magnesium sulfate with no added fragrances, dyes, or preservatives — making it a good choice for sensitive skin compared to scented bath products. If you're new to Epsom salt baths, start with a smaller amount (1 cup instead of 2) to test your reaction. Discontinue if any irritation occurs.

• USP Grade magnesium sulfate — the highest purity designation for personal care applications
• Third-party lab tested for purity and screened for heavy metal content
• Packaged at our FDA-registered facility in Madera, California
• No added fragrances, dyes, fillers, or preservatives

• 90-day money-back guarantee — if you're not satisfied, we'll make it right
• Free shipping on orders over $100
• Questions? Contact us at questions@greenwaybiotech.com

• Magnesium sulfate is naturally occurring and biodegradable
• Safe for septic systems and environmentally benign at normal use concentrations
• Sourced from within the United States, reducing transportation impact
• We are continuously evaluating more sustainable packaging options

Greenway Biotech, Inc. has been a family-owned fertilizer and wellness company since 1989. We relocated our operations to Madera, California to be closer to the agricultural communities in the San Joaquin Valley that rely on our products. Our FDA-registered facility, third-party testing program, and commitment to accurate, educational content reflect our belief that customers deserve to know exactly what they're buying and why it works.