NOW Calcium Carbonate Powder
Brand: NOW · Form: POWDER [E0162]
Our assessment
Our assessment: Calcium is a critical mineral for your body, but the evidence shows you need to be precise with your intake. The data confirms that calcium supports bone mineralization and neuromuscular relaxation [NIH ODS]. However, high intakes come with real risks, so this is not a supplement to take casually.
How it works
Think of calcium as a structural builder and a signal messenger. It deposits into your bones to maintain density and strength, and it helps your muscles relax and your nerves send signals properly [NIH ODS]. Without enough calcium, your body will pull it from your bones, which can weaken them over time.
Safety profile
The FDA has received 592,059 adverse event reports for this product category [FDA data]. High calcium levels in your blood and urine can cause 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]. Some research also suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Our recommendation: Do not exceed the recommended dietary allowance without medical supervision. If you take other medications, separate your calcium dose by at least two hours to avoid absorption issues [NIH ODS]. Start with food-based calcium sources first, and only use this powder if you have a confirmed need. Data not available for specific dosing per serving from this label.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 12.0 oz. 340.0 g |
| 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