Recently, a topical magnesium salt went viral on Threads, drawing widespread attention to the role of “magnesium” in promoting sleep. But what functions does magnesium actually serve in the human body? Does topical or oral administration work better? Let Pharmacist Chou guide you through a deep dive into the benefits of magnesium, recommended intake levels, and supplementation methods!
Why is Poor Sleep Related to Magnesium?
Magnesium is an essential mineral in the human body. As a cofactor for numerous enzymes and biological reactions, it participates in the production of serotonin and the secretion of melatonin. It also acts on GABA receptors, which have a calming and soothing effect on the nervous system. Therefore, magnesium can help reduce anxiety, promote a calmer and more relaxed mental state, and effectively alleviate insomnia.
Research suggests that supplementing 200–400 mg of magnesium one hour before bedtime can help improve sleep quality. Additionally, magnesium assists in the secretion of dopamine, norepinephrine, and epinephrine, playing a vital role in blood sugar regulation, the nervous system, bones, and muscle tissues.
Four Common Forms of Magnesium: Vastly Different Absorption Rates!
Can topical magnesium really relieve stress and aid sleep? According to scientific evidence, magnesium ions are actually difficult to absorb through the skin. The viral massage magnesium salts on Threads may seem effective primarily due to factors like fragrance and physical relaxation from the massage itself. If your goal is to supplement magnesium to improve sleep quality, dietary intake or oral magnesium supplements remain much more effective options.
Since the human body cannot synthesize magnesium on its own, it must be obtained through our daily diet. Foods with high magnesium content include kelp, nuts, dark green leafy vegetables, legumes, and seafood. Alternatively, oral magnesium supplements can be taken to ensure adequate intake.
The four most common forms of magnesium supplements on the market are as follows:
| Form | Characteristics & Suggestions |
| Magnesium Oxide | This is the most common form found on the market. However, it has an absorption rate of only 3%–4% and increases gastrointestinal motility. It is commonly used as a stool softener and is not recommended as a primary form for magnesium supplementation. |
| Magnesium Citrate | It offers a high absorption rate and is budget-friendly, but it can easily cause gastrointestinal discomfort or lead to diarrhea in sensitive individuals. |
| Magnesium Gluconate | Its absorption rate is lower than that of magnesium citrate and magnesium glycinate, and it tends to carry a relatively higher price tag. |
| Magnesium Glycinate | This form has the highest absorption rate and does not cause diarrhea. Upon absorption, it releases glycine, which helps produce serotonin. For individuals who need neuromuscular relaxation and improved sleep quality, this is an excellent choice that offers multiple benefits. |
Who Needs Magnesium Glycinate Supplementation?
There are many reasons for magnesium deficiency. Some people lose magnesium due to medications or poor gastrointestinal absorption, but for most, it is due to insufficient dietary intake. According to the Dietary Reference Intakes (DRIs), the recommended daily magnesium intake for adults is 380 mg for men and 320 mg for women, with a tolerable upper intake level of 700 mg.
Surveys indicate that nearly 80% of people in Taiwan fail to meet the daily recommended magnesium intake. The following groups should be especially mindful of potential magnesium deficiency:
- Those who prefer meat over vegetables, consume diets high in fat and sugar, or regularly eat processed foods containing added phosphates (which deplete body magnesium or hinder its absorption).
- Individuals with hypertension, diabetes, or metabolic syndrome.
- Those with chronic diarrhea or gastrointestinal disorders that impair nutrient absorption.
- People taking medications long-term, such as antacids, anti-inflammatory drugs, antibiotics, diuretics, or steroids.
- Athletes or individuals who engage in high-intensity exercise and sweat heavily.
- Those who consume excessive alcohol.
- Individuals prone to nervousness, insomnia, depression, or anxiety.
It is recommended that these groups consider supplementing with magnesium glycinate to achieve adequate intake.
Note: If you have abnormal kidney function, please consult a physician for evaluation before supplementing with magnesium to prevent excess minerals from straining the kidneys.
Q&A
1. What are the common symptoms of magnesium deficiency?
Magnesium ions help relax both mind and body. Therefore, when the body lacks magnesium, symptoms such as mood swings, tension, anxiety, pronounced fatigue, and general malaise can easily occur. Other symptoms may include loss of appetite, weakness in the limbs, muscle cramps, dizziness, headaches, memory decline, disrupted circadian rhythms, and insomnia. If these symptoms occur repeatedly, it is recommended to get your magnesium levels tested.
2. If the calcium tablets I take already contain magnesium, do I still need additional supplementation?
Generally, the magnesium added to calcium tablets is magnesium oxide. Its primary function is to counterbalance the gastrointestinal side effects of calcium (such as constipation), and its absorption rate is only about 3%. If you want to supplement the body’s deficient levels to improve sleep or relaxation, it is still recommended to take an additional magnesium glycinate supplement.