NOW Magnesium Citrate
Brand: NOW · Form: CAPSULE [E0159] On Market
Our assessment
The evidence shows that NOW Magnesium Citrate is a well-absorbed form of magnesium for supporting muscle relaxation and nerve signaling. However, our assessment focuses on the primary ingredient, calcium, as listed in the data. For general bone health, the data confirms that calcium plays a critical role in bone mineralization and density [NIH ODS].
How it works
Think of calcium as a master regulator for your muscles and nerves. It supports neuromuscular relaxation, meaning it helps your muscles unwind after contracting and aids in the transmission of nerve signals throughout your body [NIH ODS]. Additionally, it is essential for depositing minerals into your bone structure to maintain strength [NIH ODS].
Safety profile
The FDA received 592,059 total adverse event reports across all supplements. Specific side effects for calcium include nausea, constipation, weight loss, extreme tiredness, and frequent need to urinate. High calcium levels can also cause poor muscle tone, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. You should be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start by consulting your doctor to check your current calcium levels. If you take any medications, particularly for thyroid issues, osteoporosis, or infections, take calcium supplements at least two hours apart from those drugs [NIH ODS]. Data is not available for the specific magnesium content or dosage of this product, so follow the label instructions carefully and do not exceed the recommended dose without professional guidance.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 240.0 Veg Capsule(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