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Missing out on magnesium from your diet? Try an added supplement.

Caroline Igo (she/her/hers) is an editor for CNET Wellness and a certified Sleep Science Coach. She received her bachelor's degree in creative writing from Miami University and continues to further her craft in her free time. Before joining CNET, Caroline wrote for past CNN anchor Daryn Kagan.

Magnesium is essential to the human body, it promotes muscle and nerve health and supports energy production. Despite its importance to our overall well being, an estimated 75% of US adults aren't getting enough magnesium in their diets. But before you buy a magnesium supplement, talk to your doctor to ensure that you need it. Too much magnesium from food sources isn't a concern for the average adult. However, the same isn't true for supplements. Too much magnesium from supplements can cause nausea, diarrhea and abdominal pain. 

Here is what you need to know. 

Read more: Why You Should Add Magnesium to Your Diet

Magnesium is one of the most abundant minerals in the human body -- it plays a vital role in various bodily processes such as muscle movements and brain function. Studies reveal magnesium may improve depression symptoms, heart health and blood sugar levels.

There are many types of magnesium, which include magnesium aspartate, magnesium carbonate, magnesium chloride, magnesium citrate, magnesium gluconate, magnesium hydroxide, magnesium lactate, magnesium oxide and magnesium phosphate. The form of magnesium is determined by what it is bound with (for example, magnesium citrate is magnesium bound with citric acid), and some forms are more easily absorbed by the body than others.  

Magnesium is found naturally in foods such as:

If your diet lacks many of these foods, you may need added magnesium. If you already take a multivitamin with magnesium, you don't need an extra supplement. Consult your doctor before adding magnesium supplements to your diet. 

We reviewed a number of magnesium supplements, along with their prices, brands, ingredients and consumer reviews. Here are our picks for the best magnesium supplements. 

Dosage: 2 softgels, daily with a meal Form of magnesium: Magnesium citrate

Nature Made is a reliable brand that often makes our lists. Not only are its vitamins affordable, but Nature Made products are United States Pharmacopeia Verified. Its magnesium supplements are also gluten-free and don't contain any dyes, synthetic colors or flavors. Each dosage of two softgels contains 250 milligrams of magnesium in the form of magnesium citrate, about 60% of recommended daily value. In addition to magnesium, the softgels also contain medium chain triglycerides, gelatin, rapeseed, glycerin, water and yellow beeswax. 

Dosage: 1 tablet, daily with a meal Form of magnesium: Magnesium oxide

Nature's Bounty is another well-known and accessible brand. Sold in Target, Walmart, Walgreens and CVS, Nature's Bounty has been producing quality vitamins for over 50 years. Its products, including its magnesium supplement, contain no artificial color, flavor, sweeteners, sugar, starch, soy, gluten, wheat, yeast or fish. The supplements contain 500 mg of magnesium oxide, which is about 119% of the daily recommended value. They also contain vegetable cellulose, dicalcium phosphate, calcium carbonate, citric acid, medium chain triglycerides, polydextrose and vegetable magnesium stearate. 

Dosage: 1 capsule, daily Form of magnesium: Magnesium oxide, magnesium citrate, magnesium aspartate

Supplements by Now are for vegans and vegetarians. The capsules are non-GMO and are free of wheat, gluten, soy, milk, egg, fish, shellfish, tree nuts and sesame. Now's magnesium supplements contain 400 milligrams of a magnesium blend (magnesium oxide, magnesium citrate and magnesium aspartate), totaling 95% of the daily recommended value. The other ingredients include hypromellose (cellulose capsule), rice flour, silicon dioxide and stearic acid (vegetable source). 

Dosage: 1 teaspoon in 8 ounces of water, daily Form of magnesium: Magnesium carbonate 

Garden of Life offers a powder magnesium supplement for those who don't want to swallow pills. Just add 1 teaspoon to a cup of room temperature water, let fizz, stir well and drink. The powder contains a magnesium blend of non-GMO citric acid, magnesium carbonate and sodium bicarbonate, organic brown rice protein magnesium chelate, organic raspberry flavor, organic lemon flavor and organic stevia extract (leaf). There are also three probiotic strains added: Lactobacillus plantarum, Lactobacillus bulgaricus and Lactobacillus acidophilus. The magnesium blend is 350 milligrams, which is 85% of the daily recommended value. There is also 120 milligrams of sodium, and the probiotic blend is 3.5 milligrams.  

Dosage: 4 milliliters (4 full droppers; 0.8 teaspoons), daily with juice or food Form of magnesium: Magnesium chloride 

Liquid magnesium is also a great option for those who dislike swallowing pills. Trace Minerals' liquid magnesium comes with a measured dropper, making it easy to know how much magnesium you are getting. However, it is recommended that you don't take all 4 milliliters in one sitting. It's best to distribute the serving size throughout the day. One daily dose of this liquid is 400 milligrams of magnesium chloride -- 100% of the daily recommended value. In addition to magnesium, the bottle also contains potassium, sulfate and boron. All of the ingredients are natural, non-GMO and gluten-free and made without artificial flavors, sweeteners and any known allergens. 

Yes. The daily Recommended Dietary Allowances of magnesium for adults between 19 and 30 years is 400 milligrams for men and 310 milligrams for women. For adults older than 30 years, men should take 420 milligrams and women 320 milligrams. However, you shouldn't take a magnesium supplement daily if you're already obtaining your daily amount in your diet. Speak with your doctor before adding any supplements to your diet.  

According to the National Institutes of Health, the recommended intake of magnesium depends on age and sex. Women and girls aged 14 to 18 require 360 milligrams; from aged 19 to 30 they require 310 milligrams; and from age 31 to 50 and above they need 320 milligrams. Men and boys aged 14 to 18 need 410 milligrams; at 19 to 30 they need 400 milligrams; and from 31 to 50 and above they require 420 milligrams. 

According to Health Direct, symptoms of low magnesium include:

The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives.