Messi Biology states that in the field of food nutrition fortification, magnesium oxide (MgO), as a vital magnesium supplement, has become a widely used nutritional fortifier in the food industry due to its unique advantages. It not only efficiently replenishes the essential magnesium required by the human body but also features high stability and safety, playing a significant role in enhancing the nutritional value of food and improving public nutritional status.
Magnesium is an essential macro-mineral for the human body, participating in the regulation of over 300 enzyme activities. It is crucial for energy metabolism, nerve conduction, muscle contraction, bone health, and various other physiological functions. While adults require a daily intake of 300–400 mg of magnesium, the refinement of modern diets has led to widespread magnesium deficiency. As a magnesium source, the core advantage of magnesium oxide lies in its extremely high magnesium content—theoretically exceeding 60%—which far surpasses organic magnesium salts such as magnesium citrate and magnesium lactate. Consequently, even small additions can meet nutritional fortification requirements, significantly reducing production costs.
In terms of bioavailability, food-grade magnesium oxide performs reliably. After entering the human body, it quickly dissociates into free magnesium ions under the action of gastric acid, reaching an intestinal absorption rate of 30%–40%, allowing it to be effectively absorbed and utilized. Furthermore, magnesium works synergistically with calcium, phosphorus, and Vitamin D to promote calcium absorption. This is of great significance for maintaining bone health and preventing osteoporosis, making it particularly suitable for populations with high calcium and magnesium needs, such as infants, the elderly, and pregnant or lactating women.
The exceptional stability of magnesium oxide makes it an ideal choice for food processing. It is a white, odorless powder that is resistant to acids, alkalis, and high temperatures. It is compatible with full-process industrial operations, including mixing, homogenization, sterilization, and filling. It does not decompose or react with proteins and vitamins, thereby avoiding food precipitation, discoloration, or off-flavors, and ensuring the original flavor and texture of the food remain unaffected. It is widely applied in plant-based protein drinks, sports drinks, dairy products, cereal products, and nutritional meal replacements.
Regarding safety, magnesium oxide fully complies with national standards. According to GB1886.216-2016, its purity is ≥99.0%, and indicators for heavy metals and microorganisms are far below the safety limits. JECFA evaluations have determined it to be safe, with an ADI (Acceptable Daily Intake) value of “not specified,” meaning there are no safety concerns when used according to regulations. However, the dosage of magnesium oxide must be controlled. Excessive amounts may affect the taste of food due to its weak alkalinity or lead to gastrointestinal discomfort. In practical applications, the dosage must strictly follow the GB14880 standard, with precise additions based on food categories and the specific needs of the population.
As a nutritional fortifier, magnesium oxide—with its high content, reliable absorption, stability, and safety—can effectively supplement magnesium and enhance food nutrition. With the growth of health awareness, it will see even broader applications in the field of nutritional fortification, helping the public achieve balanced nutrition and safeguard their health.