Marine magnesium is a dietary supplement derived from natural oceanic sources. Unlike standard supplements that are often produced synthetically, marine magnesium is harvested directly from the earth’s waters. This nature-based option is sourced and processed for various health products, offering an alternative to common magnesium compounds.
Sources and Extraction of Marine Magnesium
The primary source for marine magnesium is seawater, which contains magnesium ions at a concentration of less than 1300 parts per million. The extraction process, often referred to as the Dow process, involves treating large volumes of seawater. A substance like lime is mixed with the seawater, causing the magnesium ions to precipitate out of the solution as solid magnesium hydroxide, which can then be separated from the remaining liquid in large settling ponds.
This collected magnesium hydroxide undergoes further purification. It is treated with hydrochloric acid to create a concentrated and purified magnesium chloride solution. This multi-step procedure effectively isolates the magnesium from the sodium chloride and other impurities present in the initial seawater.
Another significant source of marine magnesium is calcified seaweed, specifically the red algae Lithothamnion calcareum. This organism naturally absorbs and mineralizes nutrients from the cold Atlantic waters. Over its lifespan, it accumulates magnesium, calcium, and other trace minerals within its cellular structure. The mineral-rich skeletal remains of the algae are then sustainably harvested, washed, dried, and milled into a powder, providing a plant-based source of marine minerals.
Unique Mineral Profile and Bioavailability
Marine magnesium supplements are distinct because they are typically a multi-mineral complex, not just an isolated form of magnesium. Alongside magnesium, these supplements often contain over 70 other trace minerals absorbed from their marine environment. This includes minerals such as calcium, boron, selenium, potassium, and zinc, which work together within the supplement.
The term bioavailability refers to how well the body can absorb and utilize a nutrient. The bioavailability of marine magnesium, which is often in the form of magnesium hydroxide or carbonate from its natural state, has been studied in comparison to other forms. Research using in vitro models suggests that the magnesium from marine sources like Aquamin® is significantly more bioavailable than magnesium oxide, a common and less soluble form of the supplement.
The unique, porous physical structure of marine-derived minerals, particularly from sources like Lithothamnion, contributes to their bioavailability. This structure, along with the presence of numerous other trace minerals, is thought to enhance the body’s ability to absorb the magnesium. Studies have shown that its absorption profile is comparable to more soluble forms like magnesium chloride and superior to the less absorbable magnesium oxide.
Health Applications of Marine Magnesium
Magnesium is involved in over 300 biochemical processes in the body. It is recognized for its role in regulating muscle and nerve function, which can help alleviate muscle cramps and support relaxation. The mineral also contributes to energy production at a cellular level and is involved in the pathways that support restorative sleep.
The multi-mineral composition of marine magnesium makes it particularly relevant for certain health applications, most notably bone health. Strong bones require more than just calcium; magnesium works alongside calcium and vitamin D to maintain bone mineral density. Studies have indicated that supplementation with marine minerals may help older individuals improve or maintain their bone density.
Some research suggests that its mineral complex, such as the patented ingredient Aquamin®, can help manage healthy inflammation responses in the body. This is attributed to the synergistic action of magnesium and the accompanying trace minerals. By providing a broad spectrum of minerals, these supplements support overall mineral balance for numerous bodily systems, including cardiovascular health.
Consumer Guidance for Marine Magnesium Supplements
When selecting a marine magnesium supplement, examine the product label for details. Look for trademarked ingredients, such as Aquamin®, which indicates the product uses a well-researched, specific source of marine minerals derived from either seawater or red algae. Reputable brands often provide transparency about their sourcing and may feature certifications from third-party organizations that test for purity and contaminants like heavy metals.
Dosage can vary, so it is important to follow the instructions provided on the supplement label or consult with a healthcare provider for personalized advice. The recommended daily intake for magnesium differs based on age and sex. Taking magnesium with a meal can sometimes enhance absorption and reduce the likelihood of digestive discomfort.
Like other magnesium supplements, marine magnesium can cause side effects if taken in high doses. The most common side effect is digestive upset, including diarrhea and nausea. Individuals with kidney conditions should be particularly cautious, as their bodies may not be able to effectively clear excess magnesium. Start with a lower dose to assess tolerance.