Major Calcium 600 mg + D3 200 IU

Our assessment

The evidence shows that a combination supplement like Major Calcium 600 mg + D3 200 IU can be a convenient way to support bone health, but you need to be aware of the specific risks and limitations. For calcium, the data confirms that it is essential for bone mineralization and neuromuscular relaxation [NIH ODS]. However, we do not have specific data on the 600 mg calcium and 200 IU vitamin D3 dosage combination from the provided information, so you should compare the label to your personal dietary needs.

How it works

Think of calcium as the primary building block for your bones. It supports bone density and mineral deposition, while also helping your muscles relax and nerves signal properly [NIH ODS]. The vitamin D3 (200 IU) is included to help your body absorb that calcium more effectively, though the provided data does not include specific vitamin D3 mechanism details for this product.

Safety profile

FDA received a total of 592,059 adverse event reports across all products in this category [FDA data]. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. High levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Note: The provided data does not include a breakdown of report counts for each individual side effect.

Our recommendation

Start by checking your total daily calcium intake from food and other supplements. Calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for specific dosing timing, so take this supplement separately from those medications. Compare the 600 mg calcium and 200 IU D3 on the label to your RDA before starting.

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