Lisa

"Best salt on earth. If you haven’t tried this salt, you’re MISSING out. Best quality of REAL salt there is. I’ll never use anything else!"

mSalt | Icelandic Flake Salt

Rated 5.0 out of 5

Based on 795 reviews

Pure and mineral rich sea salt, sourced from the pristine waters of Iceland.

Size 4 oz.

4 oz.

75 Servings

8 oz.

150 Servings

1 lb.

300 Servings

Item is in stock Only 0 left in stock Item is out of stock Item is unavailable

Benefits
- Optimal Hydration & Electrolyte Balance.
- Energy & Adrenal Support.
- Digestive Health & Gut Function.
- Muscle Recovery & Function.
- Thyroid & Metabolic Wellness.
- Improved Cognitive Function & Mental Clarity.

Ingredients

Pure, unadulterated salt harvested from the purest ocean in the world: Icelandic salt beds. Nothing more. Nothing less.

How to Use
Take daily, up to 7 days a week, depending on your personal requirements.
Serving size: 1/4 tsp (1.5 g)
Calories: 0
- Food: Sprinkle on meats, vegetables, salads, and baked goods for enhanced flavor and nutrition.
- Beverages: Add a pinch directly to water, pre-workout smoothies, mixed drinks and juices for improved hydration and electrolyte balance.
- Salt Brine (Sole): Add ⅓ cup Icelandic Flake Salt to ⅔ cup Filtered & Structured Water and Stir. Let sit 12-24 hours and store in a mason jar. No metal lids!
- Add ½ teaspoon to a gallon of water at a time; store refrigerated.
- Skin Care: Use as a natural exfoliating scrub to gently remove dead skin and promote softer skin.
- Mouth Rinse: Use in a saline solution for oral hygiene.
- Neti Pot: Ideal for sinus irrigation, promoting clear nasal passages.

How to Store

Storage: Keep in an airtight container to maintain freshness.

We traveled far and wide to find the best sea salt in the world.

mSalt delivers a superior electrolyte profile that supports hydration, muscle function, and wellness—without the microplastics or heavy metals found in Himalayan and Celtic salt. Hand harvested from Icelandic waters, our salt tastes crisp, bright, and well-rounded.

With its soft, delicate texture, it’s the perfect finishing salt for cooking, baking, and seasoning. Satisfying and delicious, add our pure sea salt to your pantry. It’s crucial for both wellness and flavor.

Lisa

"Best salt on earth. If you haven’t tried this salt, you’re MISSING out. Best quality of REAL salt there is. I’ll never use anything else!"

Why Icelandic Flake Salt?

Geography +

Iceland’s unique geography is key to mSalt’s exceptional purity. The island's remote location and naturally filtered ocean waters create one of the cleanest marine environments on Earth. As seawater passes through volcanic rock, it undergoes a natural purification process, enriching the salt with vital minerals like magnesium, potassium, and calcium while keeping out contaminants.

Mineral profile +

Sodium-chloride, NaCl

Sodium (Na): 42.13% – Naturally abundant for proper fluid balance, nerve function, and cellular hydration without the excess impurities found in Himalayan salt.
Chloride (Cl): 54.51% – Essential for digestion and electrolyte balance, naturally occurring without contaminants.
Magnesium (Mg): 1.79% – 3x more magnesium than Celtic salt and significantly higher than Himalayan salt, critical for relaxation, muscle recovery, and energy metabolism.
Calcium (Ca): 0.39% – Better balanced than Himalayan salt, supporting strong bones, teeth, and nerve function without excess sedimentary contaminants
Potassium (K): 0.44% – 4x more potassium than Celtic salt, helping to regulate hydration, muscle function, and heart health.
Sulfur (S): 0.74% – Naturally present, supports joint health, detoxification, and skin health.
Trace Minerals: Contains a full spectrum of essential trace minerals, including iron, zinc, copper, selenium, manganese, and chromium, ensuring superior nutrient density.

Our independently verified Certificate of Analysis (COA) confirms Crucial FOUR's Icelandic mSalt provides superior mineral density compared to other salts. Rigorously tested by third-party laboratories globally to ensure purity, absence of microplastics, and industry-leading low levels of heavy metals.

Geothermal production +

Our process uses 100% renewable geothermal energy, ensuring a sustainable and eco-friendly approach while preserving the salt’s full spectrum of essential minerals. Our production process involves a minimum of mechanical intervention and makes use of natural geothermal energy for heating the seawater, evaporating and drying the mSalt.

Safe for the Whole Family

Name: mSalt | Icelandic Flake Salt
Brand: CrucialFourInc
SKU: CFOUR-MSALT-4OZ-1
Price: 15.0 USD
Availability: InStock
Rating: 5.0 (795 reviews)

From keeping kids hydrated to supporting seniors' joint health, mSalt is a simple, effective way to bring wholesome nutrition into your home. It’s safe, pure, and beneficial for all ages.

What makes this formula special

mSalt supports your health

Thyroid & Metabolic Wellness.

Helps regulate hormones crucial to metabolic health.

Optimal Hydration & Electrolyte Balance.

Enhances cellular hydration and maintains electrolyte levels.

Digestive Health & Gut Function.

Promotes stomach acid production for better digestion and nutrient absorption.

Muscle Recovery & Function.

Supports mental clarity, focus, and nervous system health.

Energy & Adrenal Support.

Supports adrenal glands, reducing fatigue and boosting daily energy.

Muscle Recovery & Function.

Aids muscle recovery, reducing cramps and enhancing muscle function.

Bring Home the Best of Nature

Add mSalt to your pantry and experience the difference of clean, pure sea salt. It’s a small change that makes a big impact on your wellness.

	mSalt \| Icelandic Sea Salt	Other Brands
Highest in Magnesium
Highest in Potassium
Tested for heavy metals
Gently harvested with naturally formed flakes
Geothermally processed
Zero carbon footprint
Added iodine
Microplastics
Magically delicious

Independently tested by third-party labs to guarantee exceptional purity, zero microplastics, and some of the lowest heavy metal levels in the industry.

Hi, I’m Charles Barber. Before I founded Crucial Four, I struggled with constant fatigue, brain fog, and a weakened immune system. I eventually discovered that refined salt—stripped of essential minerals—was quietly causing these issues.

That's why I created mSalt: a pure, mineral-rich sea salt harvested sustainably from pristine Icelandic waters. It made a huge difference in my life, improving my energy, clarity, and overall health.

At Crucial FOUR, if we can’t grow something ourselves, we source from trusted partners—real salt-of-the-earth people who share our values for purity, quality, and sustainability.

Charles Barber
Founder and Formulator
Crucial FOUR

Founders thoughts

Reviews from the CrucialFour Community

@havegoalswillketo

"I love Crucial FOUR's Icelandic Salt, not only is it tested for heavy metals and microplastics, it’s the tastiest, nutrient-dense salt I have ever had. I love adding a pinch in my water to keep my electrolytes balanced and be hydrated in the best way!"

@abbymchou

"As a mama of six, I’m always looking for easy ways to increase my energy and keep my family healthy — this Icelandic flake salt does both! My whole fam loves it! Even my 4-yr-old asks for the “icewandic sawt” at dinner time 😆😍"

@rachelkiperberg

"I developed preeclampsia with my first. During the pregnancy I was extremely undernourished. I limited protein limited salt and had no idea how important minerals are in order to support healthy thyroid health. This time around I have the privilege to focus on my preconception health prioritizing good salt local meats raw dairy/cheeses and lots of honey with seasonal fruits."

@alixbarthnutrition

"I have only been using Crucial FOUR for a couple of weeks now (sprinkle in water every AM), but can already tell a difference in less water retention and feeling more hydrated overall!"

@holistic_minded_chiro

"I learned about this salt through a fellow chiropractor who did research on the amounts of lead in different salts. This one was the most pure! I checked it out, loved the website, and now I add it to all my water and meals. I even use it in my morning smoothies!"

@dooonab

I love the clean crispness of the salt, and the unusual shape makes it easy to pinch from the salt bowl that I keep near the stovetop. The % of minerals though is why I bought it.

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average rating 5.0 out of 5

Based on 795 reviews

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795 Reviews

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Reviewed by Sandeep V.

Verified Buyer

I recommend this product

Age

35 - 44

Wellness Concerns

Hormonal Balance

Rated 5 out of 5

Review posted

A must!

CrucialFour Salt is truly a gift from nature. Its unrefined, rich in essential minerals, and free from additives which delivers a pure, clean flavour that has transformed my every meal. Beyond taste, it supporting my hydration and overall vitality, you can genuinely feel the difference. Once you experience this salt’s natural purity, you’ll never go back to ordinary table salt. It’s an everyday luxury for those who value health and authentic flavour.

Was this helpful?

Reviewed by Amber K.

Verified Buyer

I recommend this product

Age

25 - 34

Wellness Concerns

Sleep
Mood
Hormonal Balance

Rated 5 out of 5

Review posted

Love this salt

Been using this for a couple of years now. I make adrenal cocktails with it and also drink some in my lemon water upon first waking up.

Was this helpful?

Reviewed by Rita G.

Verified Buyer

I recommend this product

Age

55+

Wellness Concerns

Aging
Immunity
Sleep
Energy

Rated 5 out of 5

Review posted

M salt Icelandic Flake Salt

Works great in my grinder. Love using it knowing I am getting crucial minerals without heavy metals

Was this helpful?

Reviewed by ROSE K.

Verified Buyer

I recommend this product

Age

35 - 44

Wellness Concerns

Energy
Immunity

Rated 5 out of 5

Review posted

Phenomenal product

This product is great, it’s amazing how I don’t have to drink as much water to be fully hydrated when I put this salt in it. I highly recommend it.

Was this helpful?

Reviewed by Adam W.

Verified Reviewer

I recommend this product

Rated 5 out of 5

Review posted

Next Level SALT!

I really didn't think it was possible, but this has got to be the best tasting salt, ever.

Was this helpful?

Frequently Asked Questions

mSalt is hand-harvested from pristine Icelandic waters, filtered down to 0.03 microns to remove microplastics and contaminants, and evaporated using 100% renewable geothermal energy. Unlike refined table salt, which is stripped of minerals and contains additives, or Himalayan salt, which can contain sedimentary impurities, mSalt retains a balanced mineral profile and is rigorously tested for purity.

Yes. Every batch undergoes independent third-party lab testing to ensure industry-leading low levels of heavy metals and zero microplastic contamination. You can download our Certificate of Analysis (COA) for full transparency.

No. mSalt is a natural sea salt with a clean, unaltered mineral composition. If you require additional iodine in your diet, we recommend the naturally iodine-rich Spirulina found in our mDaily Greens.

For optimal hydration, add a small pinch (about 1/8 tsp) to an 8 oz glass of water. If using a salt brine (sole), start with 1 tsp per 8 oz of water. Adjust based on personal preference and needs.

Yes! The delicate Icelandic flakes are perfect for grinding or used as a finishing salt without grinding.

Keep mSalt in an airtight container in a cool, dry place. If making a salt brine, store in a glass jar in the refrigerator for long-term use.

While both provide essential minerals, mSalt is a pure, naturally balanced sea salt, while mMinerals is a liquid blend designed for targeted mineral replenishment. Learn more in our blog post.

Yes, mSalt can be safely added to a pet’s water or food in small amounts, but always consult your vet for specific dietary recommendations.

Unlike refined table salt, mSalt provides a balanced mineral profile that supports hydration and electrolyte balance. However, if you have specific health conditions, consult your doctor before making dietary changes.

You can download the full mineral profile and lab testing results by accessing our Certificate of Analysis (COA) here.

Clear urine may seem like a sign of great hydration, but it can actually indicate that you’re overhydrated and flushing out essential electrolytes—especially sodium. Your body needs a balanced level of minerals to maintain hydration, support energy, and regulate key functions like muscle contractions and nerve signaling.
If your urine is consistently clear, it may be a sign that you’re drinking too much water without replenishing lost minerals. Instead of just increasing water intake, focus on maintaining electrolyte balance by adding a pinch of high-quality, mineral-rich salt like mSalt to your water. This helps your body absorb and retain hydration more effectively without diluting essential nutrients

7 Key Minerals

Sodium 42.13%

Naturally abundant for proper fluid balance, nerve function, and cellular hydration without excess impurities.

Calcium 0.39%

Naturally abundant for proper fluid balance, nerve function, and cellular hydration without the excess impurities found in Himalayan salt.

Chloride 54.51%

Essential for digestion and electrolyte balance, naturally occurring without contaminants.

Potassium 0.44%

4x more potassium than Celtic salt, helping to regulate hydration, muscle function, and heart health.

Magnesium 1.79%

3x more magnesium than Celtic salt and significantly higher than Himalayan salt, critical for relaxation, muscle recovery, and energy metabolism.

Sulphur 0.74%

Naturally present, supports joint health, detoxification, and skin health.

Trace Minerals

Contains a full spectrum of essential trace minerals, including iron, zinc, copper, selenium, manganese, and chromium, ensuring superior nutrient density.

Our independently verified Certificate of Analysis (COA) confirms Crucial FOUR’s Icelandic mSalt provides superior mineral density compared to other salts. Rigorously tested by third-party laboratories globally to ensure purity, absence of microplastics, and industry-leading low levels of heavy metals.

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