NOW Magnesium Citrate
Brand: NOW · Form: CAPSULE [E0159] On Market
Our assessment
The evidence shows that magnesium citrate is a well-absorbed form of magnesium, often used to support muscle relaxation and regularity. However, the data provided specifically covers calcium, not magnesium. For a full assessment of this product, data on magnesium is required. Based on the available calcium data, we can note general principles about mineral supplementation, but a direct analysis of NOW Magnesium Citrate is limited by the data provided.
How it works
For calcium, which is a mineral, its mechanism involves bone mineralization to support bone density and neuromuscular relaxation to support muscle and nerve signaling [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]. Data on how magnesium citrate specifically works is not available in the provided data.
Safety profile
The FDA has received 592,059 total adverse event reports across all supplements in the data set [FDA data]. Specific side effects for magnesium citrate are not available in the provided data. For calcium, high intakes might increase the risk of heart disease and prostate cancer, and high levels in the blood can cause poor muscle tone, poor kidney function, constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS].
Our recommendation
Because the data provided is for calcium, not magnesium citrate, we cannot make a specific recommendation for this product. Data for magnesium citrate is not available. If you are considering this supplement, consult your healthcare provider to ensure it is appropriate for your needs and does not interact with any medications you take. For calcium, the data shows it can interfere with certain antibiotics and thyroid medication [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 120.0 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