NOW Zinc 50 mg
Brand: NOW · Form: TABLET [E0155]
Our assessment
The evidence shows that while zinc is an essential mineral for immune function, a 50 mg dose is significantly higher than the recommended dietary allowance. For most adults, the RDA is 8–11 mg daily, and the tolerable upper intake level is 40 mg. Taking 50 mg daily puts you above that upper limit, which increases your risk of side effects [NIH ODS].
How it works
Think of zinc as a critical cofactor — it helps over 100 enzymes in your body function properly, supporting immune cell development, protein synthesis, and wound healing [NIH ODS]. However, because the body has no specialized storage system for zinc, consistent high intake can quickly lead to excess levels.
Safety profile
FDA received a total of 592,059 adverse event reports across all supplements. For zinc specifically, taking more than 40 mg daily can cause nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches [NIH ODS]. Long-term use of high-dose zinc can also lead to copper deficiency, which may cause neurological issues and anemia [NIH ODS]. Data on side effect report counts specific to this product is not available.
Our recommendation
We recommend avoiding a daily 50 mg dose unless under direct medical supervision for a confirmed zinc deficiency. For general health, a dose of 8–11 mg is sufficient for most adults [NIH ODS]. If you choose to use this product, take it with food to reduce stomach upset, and consider cycling it — for example, taking it only a few days per week — to lower your cumulative intake.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 250.0 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