NOW Magnesium & Calcium
Brand: NOW · Form: TABLET [E0155]
Our assessment
The evidence shows that this combination supplement provides a foundational mineral for bone health. Calcium is essential for bone mineralization and density, as well as neuromuscular relaxation and nerve signaling [NIH ODS]. However, you should be aware that the data on calcium is not without nuance regarding long-term safety.
How it works
Think of calcium as a structural builder and signaler for your body. It supports bone density and mineral deposition, giving your skeleton strength. At the same time, it helps your muscles relax and your nerves send proper signals [NIH ODS]. This makes it critical for everything from strong bones to a steady heartbeat.
Safety profile
FDA has received 592,059 total adverse event reports for this product. Some research suggests that high calcium intakes might increase the risk of heart disease and prostate cancer. High levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Before starting this supplement, you should review your total calcium intake from food and other supplements. Because of the potential risks associated with high calcium levels, do not exceed the recommended dose on the label. If you take any medications on the interaction list, take them at least 2 hours apart from this supplement. Always consult your healthcare provider to determine if this product is right for you [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 100.0 Tablet(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