NOW Magnesium Citrate Pure Powder
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that NOW Magnesium Citrate Pure Powder can be an effective option for increasing your magnesium intake, but you need to be aware of key safety considerations. Magnesium supports over 300 biochemical reactions in your body, including muscle and nerve function, but the specific form—magnesium citrate—is known for its high bioavailability and potential laxative effect [NIH ODS].
How it works
Think of magnesium as a calming mineral for your muscles and nervous system. It works by blocking the action of a neurotransmitter that stimulates muscle contraction, helping your muscles relax after use. This mechanism supports normal heart rhythms, blood pressure regulation, and restful sleep [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports related to this product category. The most common side effects from magnesium citrate include loose stools and diarrhea, especially when taken in doses above 350 mg daily [FDA data]. If you have kidney disease, do not use this product without medical supervision, as impaired kidneys cannot clear excess magnesium from the blood [NIH ODS].
Our recommendation
Start with a small dose—about 1/8 teaspoon—mixed in water, and gradually increase to assess your tolerance. Take it with food to minimize gastrointestinal upset. If you take medications for thyroid conditions, osteoporosis, or infections, separate your magnesium dose by at least 2 hours to avoid absorption interference [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