NOW Magnesium & Calcium
Brand: NOW · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that this supplement provides calcium, a mineral essential for bone health and nerve function [NIH ODS]. For most adults, calcium from food sources is preferred, but supplements can help fill dietary gaps. The key is to use the right dose and be aware of potential risks.
How it works
Think of calcium as a building block for your skeleton. It supports bone mineralization and density, and it also helps your muscles relax and your nerves send signals properly [NIH ODS]. This product pairs calcium with magnesium, which works alongside it for these functions.
Safety profile
Data not available for side effect reports specific to this product. However, data for calcium supplements shows high intakes may increase the risk of heart disease and prostate cancer. High blood and urine levels can cause poor muscle tone, kidney issues, constipation, nausea, weight loss, fatigue, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce absorption of bisphosphonates, tetracycline and fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start with a low dose and get your calcium levels checked if you have concerns. Take this supplement at a different time than any prescription medications you use. If you experience nausea, constipation, or unusual fatigue, stop taking it and consult your doctor [NIH ODS] [FDA data].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 100.0 Tablet(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