GNC Zinc 50

Our assessment

The evidence shows that GNC Zinc 50 is a straightforward supplement providing 50 mg of zinc. However, we must be very clear about a critical fact: the primary ingredient in the data provided is calcium, not zinc. Data for the specific product GNC Zinc 50 is not available in the provided materials. Therefore, our assessment is based on the calcium data supplied, which is not directly applicable to this supplement. You should consult the product label for the correct active ingredient and dosage.

How it works

Based on the data for calcium, which is the only ingredient data provided, the mechanism involves supporting bone density and mineral deposition, as well as aiding muscle relaxation and nerve signaling [NIH ODS]. Please note that this mechanism applies to calcium, not zinc. For accurate information on how zinc works, data is not available in the provided materials.

Safety profile

The FDA has received a total of 592,059 adverse event reports across all supplements in the database. For the calcium data provided, side effects from high 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]. Additionally, calcium can reduce the absorption of medications such as bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Data on side effects specifically for zinc is not available.

Our recommendation

Our recommendation is to stop and verify. The data provided does not match the product name. Do not take GNC Zinc 50 based on this calcium data. You must check the actual product label for its ingredients and dosage. For general guidance, do not exceed the tolerable upper intake level for any mineral without professional advice. Data for a specific recommendation on zinc is not available.

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