Magnesium Chloride USP Grade (Hexahydrate)
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Magnesium Chloride USP
99.9% Pure Dead Sea Magnesium Chloride Hexahydrate — USP Grade, 100% Edible & Ideal for Oral Use and DIY Magnesium Oil
USP Pharmaceutical Grade • 100% Edible • MgCl₂·6H₂O
Making gardens—and their humans—healthier since 1989
Magnesium Chloride USP Technical Specifications
| Product Type | USP Grade Magnesium Chloride Hexahydrate powder — 100% edible, suitable for oral solution and topical use |
|---|---|
| Chemical Form | MgCl₂·6H₂O (Magnesium Chloride Hexahydrate) |
| Grade / Purity | USP Pharmaceutical Grade — 99.9% Pure |
| Source / Origin | Dead Sea mineral brine, refined to USP specifications |
| Elemental Mg per Serving | ~180 mg elemental magnesium per 45 ml of standard solution (33 g/L) |
| Uses | Oral magnesium solution, DIY magnesium oil spray, bath soaks, foot baths |
| Free From | No fillers, anti-caking agents, or artificial additives |
| Containers | Use glass, ceramic, or food-grade plastic only — avoid metal |
| Packaged At | FDA-registered facility, Madera, California, USA |
| Testing | Third-party lab tested for heavy metals and purity; COA available |
| Safety | Consult a healthcare provider before oral use if pregnant, nursing, or on medications |
Magnesium Chloride USP Technical Snapshot
| Chemical Name | Magnesium Chloride Hexahydrate |
|---|---|
| Chemical Formula | MgCl₂·6H₂O |
| Molecular Weight | 203.31 g/mol |
| Elemental Mg Content | ~11.96% by weight (Mg MW 24.305 ÷ MgCl₂·6H₂O MW 203.31) |
| Grade | USP (United States Pharmacopeia) |
| Purity | 99.9% minimum |
| Source | Dead Sea mineral brine |
| Appearance | White crystalline flakes or powder; hygroscopic (absorbs moisture from air) |
| Solubility | Highly soluble in water; dissolves completely clear |
| Standard Oral Prep | 33 g dissolved in 1 liter of water → ~3.95 mg elemental Mg per ml |
| Typical Daily Serving | 45 ml of prepared solution → ~180 mg elemental Mg |
| 360 mg Elemental Mg | ~3 g powder (approx. ½ level tsp) dissolved directly in juice or water |
| Safe Containers | Glass, ceramic, or food-grade plastic only — never metal (corrosive) |
| Packaged At | FDA-registered facility, Madera, California, USA |
| Testing | Third-party lab tested; heavy metals screened; COA available |
| CAS Number | 7791-18-6 |
Ideal For
FEATURES
🌊 Dead Sea Source
Refined from the mineral-dense brines of the Dead Sea, a source long associated with high natural magnesium content and wellness traditions.
💊 USP Pharmaceutical Grade
Meets United States Pharmacopeia standards for identity, purity, and quality — specifications more stringent than typical food-grade material.
🍽️ 100% Edible
Suitable for preparing oral magnesium solutions as well as topical and bath applications — all from one clean, tested powder.
⚗️ Third-Party Lab Tested
Each batch is independently tested for purity, heavy metal content, and compliance with USP specifications. Certificate of Analysis available.
🔬 99.9% Pure Hexahydrate
Magnesium Chloride Hexahydrate (MgCl₂·6H₂O) — the highly soluble crystal form ideal for both oral supplementation and topical formulas.
💧 Fast and Clear Dissolving
Dissolves quickly and completely in water, producing a clear solution with no sediment or cloudiness — easy to work with at any temperature.
🏭 FDA-Registered Facility
Repackaged in our FDA-registered facility in Madera, California, with quality checks at every stage from receiving to final packaging.
✨ No Fillers or Additives
Nothing added — no anti-caking agents, flow aids, artificial ingredients, or preservatives. Just pure Magnesium Chloride Hexahydrate.
⚡ Versatile Formula
One product, multiple applications: oral solution, magnesium oil, bath flakes, and foot soak — covering the full range of magnesium routines.
🌿 Screened for Heavy Metals
Independently lab tested for heavy metal content. Results are consistently well below required limits — details available in the COA.
WHAT IS MAGNESIUM CHLORIDE HEXAHYDRATE?
Magnesium Chloride (MgCl₂) is an inorganic salt composed of magnesium and chloride ions. In its hexahydrate form (MgCl₂·6H₂O), each unit is associated with six water molecules, which makes it exceptionally soluble and easy to work with in solution.
Why Hexahydrate?
The hexahydrate crystal structure is the standard form used for both oral supplementation and topical (transdermal) magnesium applications. It dissolves clearly in water, is gentle to work with, and is the same form used in pharmaceutical and food applications worldwide.
USP Grade vs. Food Grade
Our Magnesium Chloride is USP Grade, meaning it meets strict pharmacopeial standards — generally more rigorous than typical food-grade specifications:
- Higher purity specifications with tighter impurity limits
- 99.9% minimum purity for Magnesium Chloride Hexahydrate
- Batch-level testing for heavy metals and contaminants
- Suitable for both internal consumption and topical formulations
Quality Note
Not all magnesium chloride is the same. Lower-grade products may be intended for industrial, de-icing, or dust-control use and are not appropriate for ingestion. Always look for USP Grade and ask for a batch Certificate of Analysis when choosing magnesium chloride for wellness use.
HOW MAGNESIUM CHLORIDE MAY SUPPORT YOUR WELLNESS
Magnesium is involved in hundreds of biochemical reactions in the body, and many people don't meet recommended intake levels through diet alone. Magnesium Chloride USP is commonly used as part of routines supporting:
😴 Restful Sleep
Many people take magnesium in the evening to help unwind and support deeper, more restful sleep as part of their nightly routine.
💪 Muscle Comfort
Magnesium plays a role in normal muscle contraction and relaxation and may help provide comfort after physical activity or long days.
🧠 Relaxation & Calm
Often used as part of an evening routine to support a sense of calm and help the body wind down from everyday stress.
🍽️ Digestive Comfort
The chloride component supports normal stomach acid production, which plays a role in healthy digestion.
⚡ Energy & Metabolism
Magnesium is a cofactor in ATP production — the body's primary energy currency — and supports overall metabolic function.
✨ Topical Soothing
Many people find topical magnesium a useful addition to their wellness routine for foot soaks, body applications, and relaxing baths.
Note: These are general uses of magnesium and magnesium chloride. This product is a dietary supplement and is not intended to diagnose, treat, cure, or prevent any disease.
HOW TO USE
Oral Magnesium Solution
Always follow the directions printed on your bag. A commonly used preparation method:
- Dissolve 33 grams (approximately 5 level teaspoons) of Magnesium Chloride USP in 1 liter of water.
- Stir in a glass container until completely dissolved.
- Take 45 ml (about 1.5 oz) once per day, or as directed by your healthcare provider.
- This 45 ml serving provides approximately 180 mg of elemental magnesium.
- At this rate, one liter of prepared solution lasts approximately 22 days.
Quick Dose Reference — Adding to Juice or Water
Prefer to skip the pre-mixed liter and just stir a measured amount directly into a glass of juice, water, or any non-carbonated drink? Magnesium Chloride USP dissolves quickly and clearly with no taste issues at these amounts:
| Powder Amount | Approx. Elemental Mg | Notes |
|---|---|---|
| ¼ teaspoon (~1.5 g) | ~180 mg elemental Mg | Common starting amount; equivalent to the standard 45 ml daily serving |
| ½ teaspoon (~3 g) | ~360 mg elemental Mg | Meets most adults' full daily magnesium target (310–420 mg RDA) |
| ¾ teaspoon (~4.5 g) | ~540 mg elemental Mg | Above typical daily target — only use under professional guidance |
How to use: Stir your measured amount into 6–8 oz of cold water, juice, or a non-carbonated beverage of your choice. Dissolves in seconds. The flavor is mildly salty-bitter at higher amounts — orange juice or a flavored drink masks it well.
Note: These figures are based on Magnesium Chloride Hexahydrate being approximately 12% elemental magnesium by weight. Teaspoon volume can vary slightly depending on how the powder is settled. For precise dosing, a kitchen scale is recommended.
Pro Tip: Morning or Evening?
Many people prefer taking their magnesium solution in the evening to support relaxation and sleep. Try it 30–60 minutes before bed as part of a consistent routine. If you're sensitive to magnesium, start with a smaller serving and increase gradually.
How We Calculate Elemental Magnesium
Every magnesium compound contains a different percentage of actual (elemental) magnesium. Knowing this percentage lets you accurately calculate how much of any preparation delivers a specific dose.
For Magnesium Chloride Hexahydrate (MgCl₂·6H₂O):
- Molecular weight of MgCl₂·6H₂O = 203.31 g/mol
- Molecular weight of elemental Mg = 24.305 g/mol
- Elemental Mg fraction = 24.305 ÷ 203.31 = ~11.96%
This means every gram of Magnesium Chloride Hexahydrate powder contains approximately 120 mg of elemental magnesium. All dose figures on this page — the 45 ml daily serving, the ½ tsp direct powder table, and the calculator results — are derived from this same calculation. For precise dosing, a kitchen scale is more reliable than teaspoon measurement since powder density can vary with settling.
- Mix equal parts Magnesium Chloride USP powder and warm distilled water (e.g., ½ cup each).
- Stir until completely dissolved and allow to cool to room temperature.
- Transfer to a glass spray bottle.
- Spray onto arms, legs, or feet and gently massage into the skin.
For a step-by-step walkthrough, see: How to Make Magnesium Oil Using Magnesium Chloride.
Baths & Foot Soaks
- Full Bath: Add ½–1 cup of Magnesium Chloride USP to a warm bath for a relaxing soak.
- Foot Bath: Add ¼–½ cup to a basin of warm water and soak feet for 20–30 minutes.
- Combination Soak: Combine with Epsom Salt for an enhanced relaxation bath routine.
When Magnesium Chloride USP Is the Right Choice
- You prefer to prepare your own oral magnesium solution from a pharmaceutical-grade raw material
- You want to make DIY magnesium oil at a lower cost per ounce than ready-made spray
- You want one product that covers oral, topical, and bath applications
- You value USP-grade documentation including a Certificate of Analysis
When to Consider Other Options
- Want a ready-to-use spray with no mixing → Magnesium Oil Spray
- Prefer a moisturizing cream for targeted massage → Magnesium Cream
- Looking for a classic bath soak experience → Epsom Salt (Magnesium Sulfate)
Container & Storage
- Always use glass, ceramic, or food-grade plastic — magnesium chloride can corrode metal containers and utensils.
- Store dry powder in a cool, dry place with the bag sealed tightly.
- Store prepared solution in a glass container at room temperature, away from direct sunlight.
- If the solution crystallizes, place the bottle in a bowl of warm water and swirl gently until crystals dissolve.
MAGNESIUM CHLORIDE CALCULATOR
Use our calculator to determine quantities for your oral solution, DIY magnesium oil, or bath soak.
MAGNESIUM CHLORIDE VS. OTHER MAGNESIUM FORMS
Different forms of magnesium serve different purposes. Here's a general overview of how Magnesium Chloride compares:
| Form | Typical Use | General Tolerance | Notes |
|---|---|---|---|
| Magnesium Chloride (USP, Hexahydrate) | Oral solutions, magnesium oil, foot soaks | Generally gentle when dosed appropriately | Highly soluble; versatile for oral and topical use |
| Magnesium Citrate | Oral supplements, occasional laxative | Commonly well tolerated | Often used for digestive support; can loosen stools at higher doses |
| Magnesium Glycinate | Capsules for relaxation & sleep support | Generally gentle | Amino acid chelate; popular for sensitive digestion |
| Magnesium Oxide | Tablets, antacids | More likely to cause digestive upset | Less soluble; primarily used as an osmotic laxative |
| Magnesium Sulfate (Epsom Salt) | Bath soaks, limited oral use | Topically well tolerated; oral use can be strong | Traditionally used in baths; oral use typically for short-term needs |
Why Many People Prefer Magnesium Chloride
It combines high solubility with flexible use — you can prepare an oral solution, mix a topical magnesium oil, or add it to baths and foot soaks, all from the same USP Grade powder.
SAFETY & HANDLING
Usage Precautions
- If pregnant, nursing, taking medications, or managing a kidney or cardiovascular condition, consult your healthcare provider before use
- Do not exceed the recommended serving size without professional guidance
- For topical use: discontinue if irritation, redness, or discomfort occurs
- Avoid contact with eyes and mucous membranes when handling the powder or solution
- Keep out of reach of children and pets
Container & Handling Requirements
- Use glass, ceramic, or food-grade plastic only — magnesium chloride solution is corrosive to metal
- Never use metal spoons, bowls, or spray bottles when mixing or storing
- Wear gloves when handling large quantities of the dry powder
Storage Guidelines
- Store dry powder in a cool, dry location with the bag sealed tightly after each use
- Prepared oral solution: store in a sealed glass container at room temperature, away from direct sunlight
- The dry powder is hygroscopic — it absorbs moisture from the air; keep it tightly sealed
- If powder clumps, break apart and use as normal — quality is not affected
First Aid
- Skin contact: Rinse with water if irritation occurs
- Eye contact: Rinse immediately with plenty of water and seek medical attention if irritation persists
- Ingestion (large amounts): Seek medical advice; contact Poison Control if needed
COMPLETE YOUR MAGNESIUM ROUTINE
Explore our other magnesium products to build a complete relaxation and wellness routine:
💧 Magnesium Oil Spray
Ready-to-use USP Grade magnesium chloride spray in a glass bottle — no mixing required. Ideal for fast, convenient topical application after workouts or before bed.
🧴 Magnesium Cream
A smooth, moisturizing cream blended with magnesium chloride and skin-nourishing ingredients. Great for targeted massage, dry areas, and a more nourishing topical experience.
🛁 Epsom Salt (Magnesium Sulfate)
The traditional bath-soak classic. Combine with Magnesium Chloride USP in your bath for a layered magnesium relaxation routine — both forms in one soak.
🧂 Magnesium Chloride Bath Flakes
Larger-format magnesium chloride flakes designed specifically for bath and foot-soak use — easier to measure for soaking routines.
Pro Tip: Combine for Best Results
Use Magnesium Chloride USP for your daily oral solution, our ready-made Oil Spray for quick post-workout topical absorption, and Magnesium Cream for a nourishing evening massage routine.
FREQUENTLY ASKED QUESTIONS
What is Magnesium Chloride Hexahydrate?
Magnesium Chloride Hexahydrate (MgCl₂·6H₂O) is a highly soluble form of magnesium that includes six water molecules in its crystal structure. This makes it ideal for preparing oral supplements, magnesium oil, and topical uses because it dissolves readily in water and is gentle to work with. It is the standard pharmaceutical-grade form used in USP-grade magnesium chloride products.
Is this Magnesium Chloride safe to take orally?
Yes. This product is USP Grade and 100% edible, meeting pharmaceutical standards for purity and safety. Always follow the mixing and dosing instructions on the label. If you have kidney disease, cardiovascular conditions, are pregnant, nursing, or take medications, consult your healthcare provider before use.
What is the recommended oral preparation and serving?
A common preparation is to dissolve 33 grams in 1 liter of water and take 45 ml (1.5 oz) per day, providing approximately 180 mg of elemental magnesium. The recommended daily intake for adults is 310–420 mg, so one serving provides about half of typical daily needs. Consult your healthcare provider to determine the right amount for your individual situation.
Can I use this to make magnesium oil at home?
Yes. Mix equal parts Magnesium Chloride USP powder and warm distilled water, stir until dissolved, let cool, and store in a glass spray bottle. If you prefer a ready-made option with no mixing, our Magnesium Oil Spray is available in a glass bottle. See the full step-by-step guide: How to Make Magnesium Oil Using Magnesium Chloride.
Why does topical magnesium sometimes feel tingly?
A mild tingling sensation when applying magnesium oil or concentrated solutions to the skin is normal and typically fades with regular use as the skin adjusts. It tends to be more noticeable on sensitive areas or freshly shaved skin. Starting applications on the feet or legs — where skin is thicker — is a common way to ease in gradually. If tingling is uncomfortable, dilute the solution slightly with more water.
How long does one liter of prepared oral solution last?
At the standard preparation of 33 g per liter and a daily serving of 45 ml, one liter lasts approximately 22 days. Use our calculator above to estimate your supply duration based on your specific usage.
Why should I avoid metal containers with magnesium chloride?
Magnesium chloride solution is corrosive to many metals and can cause rust or metallic contamination in your solution. Always use glass, ceramic, or food-grade plastic containers and utensils when mixing and storing both the dry powder and prepared solutions.
Can I use both oral and topical magnesium together?
Yes, many people use both. Oral magnesium supports whole-body levels, while topical applications offer a localized, skin-surface experience that bypasses the digestive system. If combining both, introduce changes gradually and consult a healthcare professional if you have questions about total magnesium intake. Learn more: Is It Better to Take Magnesium Orally or Transdermally?
How long does it take to notice results?
Many people notice changes in sleep quality, muscle comfort, or sense of calm within 1–2 weeks of consistent use. More gradual benefits related to overall magnesium levels may take several weeks to a few months. Individual results vary based on baseline magnesium status, diet, consistency of use, and other factors.
GROW WITH CONFIDENCE
🏅 Quality You Can Verify
Our Magnesium Chloride USP is produced in a GMP-certified facility and independently tested for purity and heavy metal content. A Certificate of Analysis is available for every batch.
🛡️ 90-Day Guarantee
Not satisfied? We stand behind every product with a 90-day money-back guarantee. Contact us at questions@greenwaybiotech.com and we'll make it right.
🏭 FDA-Registered Facility
Repackaged in our FDA-registered facility in Madera, California — the same facility where we handle our full line of agricultural and wellness products with consistent quality controls.
🌿 About Greenway Biotech
Founded in 1989, Greenway Biotech has been a trusted source of agricultural fertilizers and wellness products. We believe clean, accurately labeled, well-tested products make a difference — in your garden and in your health routine.
DOCUMENTS
DISCOVER MORE
- How to Make Magnesium Oil Using Magnesium Chloride
- The Benefits of Magnesium Chloride
- Is It Better to Take Magnesium Orally or Transdermally? Complete Guide
- How to Know If You're Magnesium Deficient — The Complete Guide
- What Are the Benefits of Magnesium Oil on Feet? And How to Apply It
- Magnesium Chloride FAQ — Full Reference Page
HAVE QUESTIONS?
Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement regimen, especially if you are pregnant, nursing, taking medications, or have a medical condition.
