NOW Calcium Carbonate
Brand: NOW · Form: POWDER [E0162] On Market
Our assessment
The evidence shows that calcium is essential for bone health, but the data on supplementation requires careful consideration. For most adults, meeting the recommended intake through diet is preferred, and supplements should be used with caution [NIH ODS].
How it works
Calcium is a mineral powerhouse for your body. It supports bone mineralization and density, and it is critical for neuromuscular relaxation and nerve signaling. Think of it as the key that helps your muscles relax and your nerves send messages properly [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports for this product category. Some research suggests that high calcium intakes might increase the risk of heart disease and prostate cancer. High levels 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 [FDA data] [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start by assessing your dietary calcium intake before supplementing. If you choose to supplement, take it with food for better absorption and be aware of interactions with your medications. Data not available on a specific recommended dose for this product, so consult your healthcare provider for a personalized plan [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 12.0 oz. 340.0 Gram(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