21st Century Calcium Citrate Petites + D3
Brand: 21st Century · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that calcium is a well-studied mineral for bone health. For this product, 21st Century Calcium Citrate Petites + D3, we can confirm the role of calcium in bone mineralization and neuromuscular function. However, data on the specific D3 content and formulation is not available in the provided materials [NIH ODS].
How it works
Think of calcium as the fundamental building block for your skeleton. It supports bone density and mineral deposition, essentially keeping your bone structure strong. Additionally, it plays a key role in neuromuscular relaxation, meaning it helps your muscles relax and nerves signal properly after contraction [NIH ODS].
Safety profile
The FDA has received a total of 592,059 adverse event reports across all supplement categories. For calcium specifically, some research suggests high intakes might increase the risk of heart disease and prostate cancer. High levels in 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] [FDA data].
Our recommendation
You can consider this supplement if you need additional calcium, but be aware that calcium can reduce absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin. Take it at a separate time from these drugs. Monitor your total daily calcium intake from food and supplements to avoid excessive levels [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 200.0 Coated 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