Natural Factors Calcium & Magnesium Citrate
Brand: Natural Factors · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that calcium is a critical mineral for bone health and nerve function, and this product combines it with magnesium and citrate for absorption. For most adults, the goal is to meet, not exceed, the daily recommended intake for calcium, which is 1,000 mg for men up to age 70 and women up to age 50 [NIH ODS].
How it works
Calcium supports bone mineralization and density, while also playing a role in neuromuscular relaxation and nerve signaling [NIH ODS]. Think of it as the structural building block for your skeleton and a key player in how your muscles and nerves communicate. The citrate form in this product may be easier to absorb than other forms, especially if you have low stomach acid.
Safety profile
FDA has received a total of 592,059 adverse event reports for products containing these ingredients. You should be aware that high calcium intakes might increase the risk of heart disease and prostate cancer. Very high levels can cause constipation, nausea, weight loss, extreme tiredness, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS] [FDA data]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
You can take this supplement to support your bone health, but do not exceed 2,000 mg of total calcium per day from all sources. Start with one serving and take it with food to improve absorption. If you take any prescription medications, separate your calcium dose by at least two hours [NIH ODS].
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