Premier Research Labs Calcium Magnesium Plus blends coral calcium and magnesium for bone support. Learn the serving size, forms, and safety basics.
Premier Research Labs Calcium Magnesium Plus is a dietary supplement that pairs calcium with magnesium in one product, and it is marketed to support everyday mineral intake rather than to treat a medical condition. It is not a drug, and it has not been evaluated by the FDA to diagnose, treat, cure, or prevent any disease. Most shoppers pick it because one bottle covers two minerals instead of two.
What Is Premier Research Labs Calcium Magnesium Plus?
Premier Research Labs is a supplement brand that has sold nutrition-focused formulas for decades. The company was founded by Dr. Bob Marshall, so searching for dr bob marshall premier research labs is a common way new customers find the brand and its product line.
Calcium Magnesium Plus is positioned as a mineral-support formula. Depending on the lot and label version, it may also include vitamin D or other cofactors, so the Supplement Facts panel — not marketing copy — is the only reliable source for what is actually in the bottle.
Two practical points matter here. Mineral supplements are listed in elemental amounts, meaning the milligrams on the label refer to the calcium and magnesium your body actually receives, not the weight of the raw compound. A "plus" in a product name usually signals added cofactors, which means the formula can shift between production runs.
Why Calcium and Magnesium Are Usually Paired
Calcium and magnesium sit on opposite sides of the same physiological coin. Calcium is involved in muscle contraction, nerve signaling, and bone structure, while magnesium is involved in muscle relaxation, energy production, and hundreds of enzyme reactions. That relationship is why formulators often combine them.
- Bone health: both minerals are structural components of bone tissue and appear together in most bone-support formulas.
- Muscle function: calcium helps trigger contraction, and magnesium supports relaxation afterward.
- Absorption competition: the two minerals can compete for some of the same transport pathways when large doses are taken at once.
Because of that competition, many people split their calcium and magnesium intake across the day instead of taking a large dose in one sitting. A single serving from a combined product is convenient, but it is not automatically the right total for every person.
Reading the Label: Forms, Serving Size, and Elemental Minerals
The chemical form of each mineral affects how well it is absorbed and how it feels in the digestive tract. The table below compares the forms you are most likely to see on a supplement label.
| Mineral form | Mineral | Absorption notes | Common drawbacks |
|---|---|---|---|
| Calcium carbonate | Calcium | High elemental yield; best absorbed with food | Can cause constipation or gas |
| Calcium citrate | Calcium | Absorbed with or without food | Lower elemental yield per capsule |
| Coral calcium | Calcium | Chemically a carbonate; absorbed like other carbonates | Higher price per milligram |
| Magnesium citrate | Magnesium | Well absorbed and affordable | Loose stools at higher doses |
| Magnesium glycinate | Magnesium | Gentle on the stomach; often chosen for evening use | Bulkier capsules |
| Magnesium oxide | Magnesium | High elemental yield but poorly absorbed | Most likely to cause digestive upset |
Coral calcium is simply calcium carbonate harvested from marine sources, and it is not absorbed differently from other carbonate forms. If you specifically want that source, premier research labs coral calcium is sold as a standalone product, and the mineral behaves the same way no matter which bottle it comes from.
How It Fits With the Rest of the Product Line
People who buy one Premier Research Labs product often browse the rest of the catalog at the same time. Mineral formulas are frequently paired with premier research labs vitamin c, since vitamin C is water-soluble and easy to take alongside minerals without competing for the same absorption pathways. Some shoppers also keep premier research labs castor oil on hand for topical routines, which is a completely separate use case from an oral mineral supplement. Athletes who use premier research labs creatine for training often add a mineral formula to the same daily routine.
| Product | Nutrient focus | Commonly marketed for | Typical format |
|---|---|---|---|
| Premier Research Labs Calcium Magnesium Plus | Calcium and magnesium, sometimes with vitamin D | Daily mineral intake | Capsules |
| Premier Research Labs Coral Calcium | Calcium from coral sources | Calcium intake on its own | Capsules |
| Standalone magnesium supplement | Magnesium only | Muscle and relaxation routines | Capsules or powder |
| Broad multivitamin and mineral | Wide micronutrient blend | General daily coverage | Tablets or capsules |
None of these products replace a varied diet, and none of them are interchangeable. If your goal is magnesium alone, a standalone product gives you more control over the dose than a combination formula does.
Safety, Interactions, and Timing
Calcium and magnesium are generally well tolerated at label doses, but they are not risk-free for everyone. People with kidney disease should talk to a healthcare professional before taking any magnesium supplement, because impaired kidneys clear magnesium slowly.
- Magnesium: supplemental magnesium above roughly 350 mg per day commonly causes diarrhea, cramping, or nausea in adults.
- Calcium: total intake from food and supplements above 2,000 to 2,500 mg per day exceeds the tolerable upper limit for most adults.
- Medication timing: calcium can reduce absorption of iron, thyroid hormones, and some antibiotics, so separate those doses by at least two to four hours.
- Antibiotics: magnesium can bind tetracycline and fluoroquinolone antibiotics, which is another reason to stagger doses.
Talk with a pharmacist or physician before combining any mineral supplement with prescription medication, and mention every supplement you take at medical appointments.
Buying Tips and Storage
Check the Supplement Facts panel before you buy, and compare elemental calcium and magnesium per serving rather than counting capsules. A bottle with 180 capsules is not automatically a better value than one with 90 if the serving size is two capsules.
Buy from a retailer that moves inventory quickly, store the bottle away from heat and moisture, and confirm the expiration date when it arrives. If a listing claims the product treats a disease or replaces a prescription, treat that as a red flag.
Frequently Asked Questions
What is Premier Research Labs Calcium Magnesium Plus used for?
It is a dietary supplement that combines calcium and magnesium to support normal mineral intake, and it is commonly taken as part of a daily bone and muscle wellness routine. It is not FDA-approved to diagnose, treat, cure, or prevent any disease, so it should not replace medical care. A healthcare professional can help you decide whether a mineral supplement fits your diet and health history.
How much calcium and magnesium does Premier Research Labs Calcium Magnesium Plus provide?
The amount depends on the specific lot and label version, so check the Supplement Facts panel on your bottle rather than relying on product descriptions. The panel lists elemental calcium and magnesium per serving along with the serving size, which may be more than one capsule. If your diet already supplies a lot of calcium, total intake from food and supplements is what matters most.
Can I take Premier Research Labs Calcium Magnesium Plus with other supplements or medications?
It can usually be taken alongside other supplements, but timing matters with certain medications. Calcium can interfere with iron, thyroid hormones, and some antibiotics, while magnesium can bind tetracycline and fluoroquinolone antibiotics, so separate those doses by at least two to four hours. Ask a pharmacist or physician before combining it with prescription drugs.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.