Core Mineral Compounds in NOW Calcium Magnesium
The formulation of NOW Calcium Magnesium supplements is not monolithic. Instead of a single version, the company offers several products, including softgels and tablets, each with a unique list of ingredients. The key to understanding the product lies in identifying the specific compounds of calcium and magnesium used.
Calcium Sources
NOW utilizes a blend of different calcium sources to potentially enhance bioavailability and reduce digestive issues. For example, the 2:1 ratio tablets feature a complex that includes:
- Calcium Carbonate: A common and concentrated form of calcium.
- Calcium Citrate: A form that is generally well-absorbed, even without food.
- Calcium Ascorbate: A form combined with Vitamin C.
Alternatively, the softgel formula primarily uses Calcium Carbonate and Citrate. Some specialized products, like the Magnesium & Calcium tablets, also include Aquamin® TG, a seaweed-derived mineral source.
Magnesium Sources
Similarly, NOW supplements draw from a range of magnesium compounds. Common forms found include:
- Magnesium Oxide: A concentrated form of magnesium.
- Magnesium Citrate: A form known for its good absorption.
- Magnesium Glycinate: In some specific formulas, this is included for its high bioavailability and gentle effect on the stomach.
- Magnesium Taurinate: Found in certain products, this form is combined with an amino acid and is known for its role in cardiovascular health.
Complementary Nutrients and Additives
Beyond the core minerals, NOW adds other nutrients and inactive ingredients to support the supplement's function and structure.
Essential Co-Factors: Vitamin D and Zinc
Most NOW Calcium Magnesium formulas are not just a simple mineral blend. They are often fortified with additional nutrients that aid in the absorption and utilization of calcium and magnesium.
- Vitamin D3 (as Cholecalciferol): This vitamin is critical for calcium absorption and bone mineralization. It plays a vital role in regulating the amount of calcium and phosphorus in the body. A deficiency can significantly hinder the body's ability to absorb dietary calcium.
- Zinc (from Zinc Oxide or L-OptiZinc®): This trace mineral supports immune function and enzymatic activity. It also contributes to bone health, as research indicates it plays a role in the bone remodeling process.
Other Ingredients and Excipients
To create the tablet or softgel form, various fillers, binders, and coatings are used. These ingredients are typically inactive but are essential for the product's structure and stability. These can include:
- Microcrystalline Cellulose: A common filler and binder.
- Stearic Acid and Magnesium Stearate: Used as flow agents to prevent ingredients from sticking to manufacturing equipment.
- Vegetarian Coating or Bovine Gelatin: Depends on the product; used to create the capsule or tablet coating.
- Rice Bran Oil or Sunflower Lecithin: Used in softgel formulas as part of the suspension.
- Beeswax: Also used in softgel formulations.
Comparison of NOW Calcium & Magnesium Product Formulations
To highlight the differences in formulations, here is a comparison of two popular NOW products: the Softgels and the 2:1 Ratio Tablets.
| Feature | Calcium & Magnesium Softgels (with D3 & Zinc) | Calcium & Magnesium 2:1 Ratio Tablets |
|---|---|---|
| Primary Calcium Forms | Calcium Carbonate, Calcium Citrate | Calcium Carbonate, Calcium Citrate, Calcium Ascorbate |
| Primary Magnesium Forms | Magnesium Oxide, Magnesium Citrate | Magnesium Oxide, Magnesium Citrate, Magnesium Ascorbate |
| Additional Nutrients | Vitamin D3, Zinc | None (some formulas may vary) |
| Form | Softgel | Tablet |
| Absorption Rate | Formulated for easy absorption via softgel delivery | Tablet form, with different mineral complexes |
| Dietary Suitability | Contains bovine gelatin (not vegan) | Often Kosher, Vegan, and Soy Free |
Potential Benefits and Considerations
As the ingredients suggest, these supplements are designed for comprehensive support of several bodily functions, not just bone health. The inclusion of co-factors like Vitamin D3 is a significant benefit, as it addresses a common deficiency that affects calcium absorption.
For those with dietary restrictions or sensitivities, checking the 'other ingredients' list is crucial. The softgels, for instance, are not suitable for vegans due to the bovine gelatin. The tablets are generally more accommodating for specific dietary needs, but ingredients can vary by batch.
Choosing the right product depends on your needs. If you require higher magnesium or prefer a vegetarian product, the tablet version might be more suitable. If you prioritize softgel delivery for potentially better absorption, the fortified softgel version is the clear choice. It is always recommended to consult a healthcare professional before starting a new supplement regimen.
Conclusion
The ingredients in NOW Calcium Magnesium are carefully selected to provide a balanced and absorbable source of these vital minerals. The primary active ingredients are complexes of calcium and magnesium, with most formulas also including Vitamin D3 and zinc to aid absorption and provide additional health benefits. The specific list of inactive ingredients varies depending on whether the product is a tablet or softgel. By reviewing the specific product label and understanding the different mineral forms, consumers can make an informed choice that aligns with their dietary needs and health goals. For further information on mineral function, an authoritative resource is the NIH Office of Dietary Supplements.
