NOW Magnesium Citrate Pure Powder
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that NOW Magnesium Citrate Pure Powder is a well-absorbed form of magnesium, often recommended for supporting muscle function and relaxation. However, data specific to this product's efficacy is limited, and we must rely on general mineral science for guidance. For calcium, which is a related mineral, the data shows that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS].
How it works
Think of magnesium as a key regulator for hundreds of biochemical reactions in your body. For calcium, the mechanism involves bone mineralization to support bone density and neuromuscular relaxation to support muscle relaxation and nerve signaling [NIH ODS]. These processes are essential for maintaining normal muscle and nerve function.
Safety profile
FDA received 592059 total adverse event reports across all supplements, though specific reports for this product are not isolated. For calcium, side effects from high intake include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [FDA data] [NIH ODS]. High levels of calcium in the blood and urine can also cause poor muscle tone, poor kidney function, and low phosphate levels [NIH ODS]. Data not available for magnesium citrate specific side effects from this dataset.
Our recommendation
Start with the serving size listed on the label and take it with food to reduce stomach upset. Be aware that calcium supplements can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these medications, separate your calcium intake by at least two hours. For general health, stick to the recommended dietary allowance and do not exceed high doses without medical supervision [NIH ODS].
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