NOW Magnesium Oxide Pure Powder
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that calcium is a critical mineral for bone health, but supplementing with it requires careful consideration of your overall diet and health status. Our assessment is that most adults should aim to meet their calcium needs through food first, as high-dose supplements carry notable risks [NIH ODS].
How it works
Think of calcium as a key structural component for your skeleton. It supports bone mineralization and density, and it also plays a vital role in neuromuscular relaxation and nerve signaling. Your body tightly regulates calcium levels, so taking too much can disrupt this balance [NIH ODS].
Safety profile
Data not available for specific adverse event reports for this product. However, general safety data for calcium shows that very high intakes can cause poor muscle tone, poor kidney function, constipation, nausea, weight loss, extreme tiredness, frequent urination, and abnormal heart rhythms. Some research also suggests high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Additionally, calcium can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, and levothyroxine [NIH ODS].
Our recommendation
We recommend getting your calcium from dietary sources first. If you use a supplement, take it with food and in divided doses of 500 mg or less for better absorption. Be sure to check for interactions with any medications you take. A blood test can help determine if supplementation is truly needed [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