NOW Magnesium Citrate Softgels
Brand: NOW · Form: SOFTGEL CAPSULE [E0161]
Our assessment
The evidence shows that calcium is essential for bone health and muscle function, but it is important to approach supplementation with caution. While this product is labeled as magnesium citrate, the data provided on calcium is relevant for understanding mineral interactions [NIH ODS]. Our assessment: you should be aware that high calcium intakes carry potential risks, including constipation, nausea, and more serious concerns like abnormal heart rhythms and an increased risk of heart disease [NIH ODS].
How it works
Calcium acts as a master regulator for your body's structural and signaling systems. It supports bone mineralization, helping to build and maintain strong bones, and it also promotes neuromuscular relaxation, which allows your muscles to relax and your nerves to signal properly [NIH ODS].
Safety profile
The FDA has received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, high intakes can lead to constipation, nausea, weight loss, extreme tiredness, frequent urination, and abnormal heart rhythms [NIH ODS] [FDA data]. The data also notes that high levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, and a high risk of death from heart disease [NIH ODS].
Our recommendation
We recommend you do not exceed the established tolerable upper intake levels for calcium without medical supervision. Be aware that calcium supplements can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you are taking any of these medications, separate your calcium intake by at least two hours. Data not available for specific dosing of this product.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 90.0 Softgel(s) |
| Market Status | Off 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