21st Century 600 Calcium Supplement
Brand: 21st Century · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that calcium is essential for bone health, but the data reveals important safety considerations. Our assessment: this 600 mg supplement can help you meet your daily needs, but you must be careful not to exceed the recommended total intake from all sources [NIH ODS].
How it works
Think of calcium as a building block for your skeleton and a signal messenger for your nerves and muscles. It supports bone mineralization and density, and helps your muscles relax and nerves fire properly [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports across all calcium products. High calcium intakes may increase the risk of heart disease and prostate cancer. High levels in the 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 [FDA data] [NIH ODS].
Our recommendation
Start by calculating your total daily calcium from food and other supplements. For most adults, the goal is 1,000 to 1,200 mg per day from all sources. Take this 600 mg supplement with food and separate it from medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin by at least two hours [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 200.0 Tablet(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