Natural Factors Calcium & Magnesium
Brand: Natural Factors · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that a calcium and magnesium supplement can be a useful tool for supporting bone health, but it requires careful consideration of dosage and potential risks. Our assessment is based on the data provided, which highlights calcium’s role in bone mineralization and neuromuscular relaxation [NIH ODS].
How it works
Think of calcium as a key structural component for your bones, helping to maintain density and mineral deposition. It also plays a critical role in neuromuscular relaxation, which supports healthy muscle function and nerve signaling [NIH ODS]. Magnesium, while not detailed in the provided data, often works alongside calcium to support these processes.
Safety profile
The FDA has received a total of 592,059 adverse event reports for this product category. Specific side effects reported for high calcium intake include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, and abnormal heart rhythms [FDA data]. The data also notes that high calcium intakes might increase the risk of heart disease and prostate cancer, and that high levels in the blood can cause poor muscle tone and kidney function issues [NIH ODS].
Our recommendation
You should take this supplement only if you have a confirmed need for additional calcium and magnesium. Be aware that calcium can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, and levothyroxine [NIH ODS]. Given the potential for serious side effects and unclear risk of heart disease, we recommend you first assess your dietary intake and discuss supplementation with your healthcare provider. Do not exceed the recommended dosage on the label.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Natural Factors |
|---|---|
| Serving Size | |
| Contents | 90.0 Tablet(s) |
| Market Status | On Market |
How to Read This Label
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