GNC Zinc 30 mg

Our assessment

The evidence shows that zinc is a well-studied mineral, but for this specific GNC product, the data is limited. We can confirm the ingredient is zinc at 30 mg per serving, which aligns with the established Tolerable Upper Intake Level for adults [NIH ODS]. However, most of the detailed safety and interaction data available applies to calcium, not zinc. For zinc-specific guidance, much of the information you need is simply not available from the provided sources.

How it works

Zinc supports the immune system and helps with cell growth and division. The data provided does not include specific mechanisms for zinc. For comparison, calcium works as a bone mineralization agent, supporting bone density, and aids in neuromuscular relaxation for nerve signaling [NIH ODS]. Data on zinc's mechanism is not available from the provided sources.

Safety profile

Safety data for this specific product is limited. The FDA adverse event database contains a total of 592,059 reports across all supplements, but no zinc-specific report count is available for this product [FDA data]. For general safety, the data notes that high calcium intakes might increase the risk of heart disease and prostate cancer, and can cause constipation, nausea, and abnormal heart rhythms [NIH ODS]. Specific side effects and report counts for zinc from the provided FDA data are not available.

Our recommendation

Data not available to provide a specific recommendation for this GNC Zinc 30 mg product. The provided data does not include enough information on zinc's effects, interactions, or study outcomes to form an evidence-based recommendation. For general guidance, the data shows that calcium can reduce absorption of medications such as bisphosphonates and levothyroxine [NIH ODS]. For zinc-specific advice, consult a healthcare provider, as the data here is insufficient.

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