21st Century Zinc 50 mg
Brand: 21st Century · Form: TABLET [E0155]
Our assessment
The evidence shows that 21st Century Zinc 50 mg is a straightforward zinc supplement, but our assessment is based on the data available for calcium, as that is the only ingredient with detailed information provided. For zinc specifically, data on its mechanism, safety, and side effects is not available from the provided sources. For the ingredient calcium, the data confirms it plays a role in bone mineralization and neuromuscular function [NIH ODS].
How it works
Think of calcium as a structural building block for your bones and a signal regulator for your muscles and nerves. It supports bone density through mineralization and helps your muscles relax and nerves signal properly [NIH ODS].
Safety profile
The FDA has received a total of 592,059 adverse event reports across all supplements in their database [FDA data]. For calcium specifically, high intakes may increase the risk of heart disease and prostate cancer. Very 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 need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Data not available for zinc-specific recommendations from the provided sources. For calcium, do not exceed the Tolerable Upper Intake Level without medical supervision, and take calcium supplements separately from the medications listed above. Always consult your healthcare provider before starting a new supplement [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 110.0 Tablet(s) |
| 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