Frequently Asked Questions

If you can't find the answer below, contact us at and we will help you. 


How Much Does it Cost?

Go Here to get current prices in US dollars.


Where do You Ship Besides the US?

We ship to most countries, except Nigeria and others where there are frequent scammers. You are responsible for any customs, duties, taxes, and/or fees charged by your country for imported products.  


Cramp Defense® Facts:

Can I Buy This in Stores? 

No, we only sell it direct. This website is the only place to buy Cramp Defense®, not Amazon or any other online stores.  We don't want any huge companies telling us how we can and cannot sell our own product.  


Is This Product Safe? Will it Work For Me? 

The product is safe as long as it doesn't interact with your medications. Talk to your doctor or pharmacist. The product works for over 80% of people, but every person is different, so we cannot predict whether it will work for you. That's why we have the 110% guarantee for 120 days -- so you have plenty of time to try it. 


How Do I Order? Do You Take Phone Orders? Do You Take Checks?

We ONLY take online orders -- no checks or phone orders. We are a small company and don't have the staff to handle hundreds of phone orders a day. (If you have questions, email us at This encrypted website is much more secure than any phone, mail, or fax ordering system. In addition to our own website security, your card company offers an additional layer of protection against any unapproved charges. If you ever have an unapproved charge, call your card company immediately.

I Don't Have a Credit Card!

If you are unable to use a credit or debit card, we strongly recommend you purchase a Visa, Mastercard or American Express gift card, which can be found at nearly all grocery stores, convenience stores, pharmacies, and discount stores. Simply purchase a card of sufficient value, and use it just like a credit card on our website.

What is Magnesium 2-Hydroxbutanedioate? Is it the Same as Magnesium Bound to Malate?

Yes. That is the scientific name we put on our label.


How Effective is Cramp Defense™ Really? And How Quickly Does it Work?

In our experience, about 80% of people get substantial results from Cramp Defense™. By fixing their magnesium deficiency, some have become totally free of their muscle cramps; others have seen a significant decrease in the pain and/or frequency of their symptoms. This could mean that the pain is cut in half, or they only get cramps once a week instead of every night. Everyone is different. About 20% of people do not see results from Cramp Defense™, even after increasing their dose and taking it for more than a month. This usually means that magnesium deficiency is not causing their problems. This is why we offer the 110% Guarantee -- to give you plenty of time to see if it works for you. 
Most people see results immediately. But we recommend trying it for 2 weeks to give it a full chance of working.


My Blood Test Says My Magnesium Levels Are Normal -- But I Still Have Cramps!

The blood test that your doctor performed is called a SERUM magnesium test, which is part of any normal blood chemistry panel. Unfortunately, this test is not an accurate indicator of your body's storage of magnesium. Here's why: in order for your heart to beat (and for you to be alive) your body has to maintain a steady amount of magnesium in your blood at all times. It accomplishes this by pulling magnesium from your bones and tissues as needed -- including your muscles. So you can have a perfectly normal magnesium blood test and be LOW in magnesium in your muscles -- causing your cramps. 


Why Hasn't My Doctor Told Me About Magnesium?

 Many doctors know that magnesium is important for muscle cramps, but they don't realize how important, and they don't know which magnesium forms actually work. Many believe that magnesium is just another medication, able to help you control your symptoms. In reality, lack of magnesium is the hidden reason why most people get muscle cramps.

OK, So How Much Cramp Defense™ Would I Have to Take Per Day?

The smallest dose necessary to get relief. For many, the recommended dose is 2 capsules per meal, for a total of 6 capsules (420 mg of magnesium) a day. You could also take 3 capsules with both breakfast and dinner. Although many people discover that they can take a lower dose and still get great results -- you can experiment with the dose to see what works best for you. 

Aren't There Lots of Magnesium Products? What's the Difference Between Them?

There are a variety of forms and each has pros and cons:
  • Magnesium oxide and hydroxide: Supplement companies love this stuff because it is cheap as dirt. Unfortunately dirt is more effective. It is very poorly absorbed (only 8%), and is highly laxative. But nonetheless, it is what you find in most common multi-vitamins. It also happens to be the active ingredient in Milk of Magnesia. 
  • Magnesium citrate: It is well absorbed, but is also highly laxative. It is the main ingredient in those glass bottles of laxative at the drug store.  If you have ever had a colonoscopy, this is what they gave you to "clean you out". It is the main ingredient in those canisters of fizzy magnesium powder found in vitamin stores.  
  • Magnesium sulfate: Also known as Epsom Salt.  It is also very laxative -- that's partly what they sell it for.  But it is great for soaking! 
  • Magnesium glycinate: This is magnesium bound to the amino acid glycine. This form is not ideal, because... well, this gets a bit technical: Glycine acts as a "co-agonist of the NMDA receptor" where magnesium is an antagonist. What does that mean? Basically, magnesium tells your neurons to slow down, and glycine tells them to speed up.  So to a certain extent, magnesium and glycine cancel each other out. Mixing these two ingredients does not make sense, especially if relaxation is a goal of yours.  
  • Magnesium chelate or glutamate: Both are the same thing. Glutamate, like glycine, is also "NMDA agonist", with all the same problems. Plus, these products are super-cheap, in part because they frequently have substantial amounts of "unbound magnesium", i.e. the problematic magnesium oxide, as a byproduct of its manufacturing process. 
  • Magnesium chloride: Also known as road de-icer.  In supplement form, is very well absorbed, non-laxative, and free of all other side effects -- but it turns to liquid when exposed to air, making it prohibitive to deliver via capsule or tablet.  It is extremely bitter, so makes a lousy drink, too.  
  • Magnesium taurinate:  This is magnesium bound to the amino acid Taurine. It has the side effect of causing extreme drowsiness, which makes it difficult to take during the day. It is also very expensive.  
  • Cramp Defense™: High absorbing, non laxative, no weird side effects. It's an organic form found in fruits and vegetables, not some crushed up rock.

Is Cramp Defense™ Safe? Can I Take it With My Medication/Medical Condition?

Although Cramp Defense™ is only magnesium and malate, natural parts of a healthy diet, please talk to your doctor before starting any new dietary supplement. Certain conditions and medications can affect how the body processes and excretes magnesium.
We are not allowed to give medical advice. Talk to your doctor or pharmacist!

Where is it Manufactured?

Other products are manufactured all over the world by the lowest bidder. Cramp Defense™ is made in the USA, in a multi-million dollar, 80,000 square foot facility. This facility is inspected by the FDA. Furthermore, our facility has voluntarily adopted a standard even higher than FDA inspection requirements, which requires the strictest levels of purity, precision and sanitation.

Who Are You? Where Can I Buy Cramp Defense™? Is This One of Those Monthly Subscriptions?

We are MgBRIGHT LLC, and our only product is Cramp Defense™. We were founded in January 2011, and after a period of research and development, began selling the product in February 2012. Our team is based in Houston, TX and the product ships from a warehouse in Atlanta, GA. The company is a member of the Better Business Bureau. If you ever need to reach us, please email us at . For more information about the company, visit About Us.

Cramp Defense™ is only available through our secure website. It is NOT sold in stores. 

We do not sell monthly subscriptions. If you buy Cramp Defense™, you will only be charged once. We do not keep your payment info on file. 


For all other questions:


 The current sale price of Cramp Defense™ is $34.91 for a 1 month supply and $69.91 for a 3 month supply. Cramp Defense™ is ONLY available through this website, it is not carried in any stores. Click the picture of the bottle to the right to learn more and read the reviews.

If you need to return the product please send it back to the following address, via US First Class Mail. Make sure to get a tracking number. (If you do not get a tracking number we cannot accept responsibility if it is lost).

MgBright Returns
1500 Distribution Court #400
Lithia Springs, GA 30122

For all other questions. contact us at