21st Century Zinc 50 mg
Brand: 21st Century · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that this product contains 50 mg of zinc, but the data we have on file for the ingredient "Calcium" does not match the product label. Data not available for zinc-specific benefits or mechanisms from the provided sources. For calcium, the data confirms it supports bone mineralization and neuromuscular relaxation [NIH ODS].
How it works
Think of calcium as a structural building block — it is critical for bone density and mineral deposition, and it also helps your muscles relax and nerves signal properly [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports across all supplements in this data set. For calcium specifically, high intakes might 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 need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS] [FDA data].
Our recommendation
Start by checking if you need a zinc supplement — data not available on the exact zinc dose from the provided sources. For calcium, be aware that it can reduce absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Speak with your healthcare provider before starting this supplement.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 110.0 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