NOW Calcium Hydroxyapatite Caps
Brand: NOW · Form: CAPSULE [E0159] On Market
Our assessment
Our assessment: Calcium is a critical mineral for your bone health, but the data shows you need to be careful with dosing. The evidence shows that calcium supports bone density and mineral deposition [NIH ODS]. However, high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS].
How it works
Think of calcium as a structural builder for your skeleton. It supports bone mineralization and neuromuscular relaxation, helping your muscles relax and nerves signal properly [NIH ODS]. This is why getting the right amount matters for both your bones and your overall muscle function.
Safety profile
FDA received 592,059 adverse event reports for this product category. Side effects from high calcium levels include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, and abnormal heart rhythms [FDA data] [NIH ODS]. High levels in the blood and urine can also cause poor muscle tone, poor kidney function, and a high risk of death from heart disease [NIH ODS]. Data not available on specific side effect report counts for each symptom.
Our recommendation
Start by checking your total calcium intake from food and supplements. Be aware that calcium can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Take calcium separately from these medications by at least two hours. Do not exceed the recommended dose on the label without consulting your doctor [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 120.0 Capsule(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