21st Century Calcium Citrate +D3 Maximum
Brand: 21st Century · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that 21st Century Calcium Citrate +D3 Maximum is a bone-support supplement. The key ingredient, calcium, helps with bone mineralization and neuromuscular relaxation [NIH ODS]. However, you should be aware of important safety considerations before taking it.
How it works
Think of calcium as a building block for your skeleton. It supports bone density and mineral deposition, which is critical for maintaining strong bones as you age. It also helps your muscles relax and your nerves signal properly [NIH ODS].
Safety profile
FDA received 592059 total adverse event reports across all supplements. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Side effects from high calcium levels include 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]. Calcium can also reduce the absorption of bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Talk with your doctor before starting this supplement. Have your blood calcium levels checked first. Take it with food and separate it from any medications you take by at least two hours to avoid absorption issues [NIH ODS]. Data not available on the exact dosage per tablet from the provided information.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 120.0 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