NOW Magnesium Citrate
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that NOW Magnesium Citrate is a well-absorbed form of magnesium, but you need to be aware of how calcium in your diet and supplements interacts with it. Our assessment: this product is a solid choice for supporting muscle relaxation and nerve function, but you must manage your total mineral intake carefully.
How it works
Think of magnesium as a natural relaxant for your muscles and nerves. It works by supporting neuromuscular relaxation and nerve signaling [NIH ODS]. While the label states this product contains magnesium citrate, the data provided focuses on calcium, which plays a role in bone mineralization and neuromuscular relaxation as well [NIH ODS]. Both minerals work together to support your body's structural and electrical systems.
Safety profile
FDA received 592,059 total adverse event reports across all supplements, though specific data for this product is not available. For calcium, which is relevant here, high intakes can cause constipation, nausea, weight loss, extreme tiredness, and abnormal heart rhythms [NIH ODS]. High calcium levels also increase the risk of heart disease and prostate cancer [NIH ODS]. You should also know that calcium can block the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start with a low dose to assess your tolerance. Take this magnesium supplement separately from any calcium-containing foods or medications by at least 2 hours. If you take any of the medications listed above, separate them by 4 hours [NIH ODS]. Monitor for side effects like loose stools or nausea. Data not available for specific dosing guidelines for this product.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 8.0 oz. 227.0 Gram(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