GNC Melatonin 5
Brand: GNC · Form: TABLET [E0155]
Our assessment
The evidence shows that while calcium is essential for bone health, the GNC Melatonin 5 product you asked about does not contain calcium. For the ingredient calcium itself, our assessment is that it is a well-studied mineral, but you must be cautious with dosing. High intakes have been linked to serious risks, including heart disease and prostate cancer [NIH ODS].
How it works
Think of calcium as a structural builder for your skeleton. It supports bone density and mineral deposition, and it also plays a role in neuromuscular relaxation by helping your muscles and nerves signal properly [NIH ODS].
Safety profile
FDA has received 592,059 total adverse event reports across all supplements, but specific report counts for calcium alone are not broken out in the data provided. Side effects from high calcium 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] [FDA data].
Our recommendation
Data not available for the GNC Melatonin 5 product specifically, as its ingredients are not provided. For calcium, you should not exceed the RDA without medical supervision. Be aware that calcium supplements can reduce absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. Always take calcium separately from these medications by at least two hours.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | GNC |
|---|---|
| Serving Size | |
| Contents | 60.0 Vegetarian 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