NOW Calcium Ascorbate
Brand: NOW · Form: POWDER [E0162]
Our assessment
Our assessment: Calcium is a critical mineral for bone health, but the evidence shows you need to be careful with dosing. The data confirms that calcium supports bone mineralization and neuromuscular relaxation [NIH ODS]. However, high intakes from supplements may carry risks, and the FDA has received 592,059 total adverse event reports across all supplement categories, so you should approach this with a clear plan [FDA data].
How it works
Think of calcium as a structural foundation for your bones. It works through bone mineralization to support bone density and mineral deposition, and it also supports muscle relaxation and nerve signaling through neuromuscular relaxation [NIH ODS]. This makes it essential for your skeleton and your nervous system to function properly.
Safety profile
The safety profile requires attention. Some research suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. 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]. Additionally, calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data not available for specific side effect report counts for this exact product.
Our recommendation
Our recommendation: Do not exceed the RDA without medical supervision. Take calcium supplements separately from medications like thyroid hormones and antibiotics by at least two hours [NIH ODS]. Monitor for symptoms like constipation or nausea, and discuss your total calcium intake from both food and supplements with your doctor. This approach helps you get the benefits while minimizing the risks.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 8.0 oz. 227.0 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