NOW Calcium & Magnesium
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that this supplement combines two essential minerals, but the key consideration is calcium dosing. For most adults, the RDA for calcium is 1,000 mg daily, but you must account for the calcium you get from food [NIH ODS]. Taking too much can pose real risks, and our analysis focuses on helping you use this product safely.
How it works
Calcium is critical for bone mineralization, helping to build and maintain strong bones by supporting density and mineral deposition [NIH ODS]. It also plays a role in neuromuscular relaxation, which means it helps your muscles relax and your nerves signal properly after they fire [NIH ODS]. This combination supports your skeleton and your body's basic movement and communication systems.
Safety profile
Data not available for the specific side effect report count for this exact product from the FDA data provided. However, based on the calcium ingredient, you need to be cautious: high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Side effects from excessive levels include poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Also, calcium can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Do not take this supplement unless you have a confirmed need. If you take it, you must account for the calcium in your diet (dairy, fortified foods, leafy greens) to stay below 2,000–2,500 mg total per day [NIH ODS]. Take it with food for best absorption, and separate it from any medications listed above by at least 2 hours [NIH ODS]. If you have a history of kidney stones, heart disease, or prostate cancer, talk to your doctor first [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