NOW Calcium Citrate Caps
Brand: NOW · Form: CAPSULE [E0159]
Our assessment
Our assessment: Calcium is a critical mineral for bone health, and this supplement provides a well-absorbed form of the nutrient. The evidence shows that adequate calcium intake supports bone density and neuromuscular function [NIH ODS]. However, you need to be careful with dosing, as the data indicates that high intakes may carry certain risks [NIH ODS].
How it works
Think of calcium as a structural building block for your skeleton and a key messenger for your nerves and muscles. It works through bone mineralization, helping to support bone density and mineral deposition, and through neuromuscular relaxation, which supports muscle relaxation and nerve signaling [NIH ODS].
Safety profile
The FDA has received a total of 592,059 adverse event reports for this product category [FDA data]. The data shows that very high calcium 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 [NIH ODS]. Some research also suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS].
Our recommendation
Take this supplement as directed on the label, and do not exceed the recommended dose. You should be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available on a specific recommended daily intake from this product's label. For personalized advice, speak with your healthcare provider.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 240.0 Veg Capsule(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