Nature's Bounty Coral Calcium Plus Vitamin D3 & Magnesium

Our assessment

The evidence shows that the combination of calcium, vitamin D3, and magnesium in Nature’s Bounty Coral Calcium Plus is well-known for supporting bone health. For you, the key is understanding the specific doses and potential risks before adding it to your routine. Data for this specific product’s exact formulation is limited, but we can assess each core ingredient.

How it works

Think of calcium as the primary building block for your bones, supporting bone density and mineral deposition [NIH ODS]. Vitamin D3 helps your body absorb that calcium, while magnesium supports muscle relaxation and nerve signaling [NIH ODS]. Together, these nutrients work to maintain strong bones and proper neuromuscular function.

Safety profile

FDA received a total of 592,059 adverse event reports for calcium-containing products, though this number includes many different formulations. For you, the main concerns involve taking too much calcium. High calcium intake might increase the risk of heart disease and prostate cancer [NIH ODS]. Side effects from high levels include constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. You should also be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Start by checking the label for exact doses of calcium, vitamin D3, and magnesium, as these numbers are not provided here. If you have a history of kidney stones, heart disease, or take any of the medications listed, speak with your doctor before starting. For best results, take this supplement with food and do not exceed 2,000 mg of total calcium per day from all sources [NIH ODS]. Data not available for specific coral calcium benefits beyond standard calcium sources.

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide