21st Century Melatonin 5 mg
Brand: 21st Century · Form: TABLET [E0155]
Our assessment
The evidence shows that melatonin is a widely used supplement, but the data provided does not contain specific studies, efficacy claims, or dosage information for 21st Century Melatonin 5 mg. Our assessment is that, based on the data available, we can only discuss the ingredient calcium, which is listed in the NIH ODS data, and the general FDA adverse event reporting. For this specific product, key information on how it works and its benefits is not available in the provided data.
How it works
Based on the provided data, the ingredient calcium supports bone mineralization by helping with bone density and mineral deposition, and it aids in neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS]. Data on how melatonin itself works is not available in the provided information.
Safety profile
Data not available for melatonin-specific side effects from the provided FDA data. The general FDA adverse event database contains a total of 592,059 reports for all supplements, but specific report counts for this product or melatonin are not provided. For the ingredient calcium, side effects from high levels include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, and abnormal heart rhythms [NIH ODS]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, and levothyroxine [NIH ODS].
Our recommendation
Because the provided data does not include efficacy studies, specific dosage guidelines, or a safety profile for 21st Century Melatonin 5 mg, we cannot make a confident recommendation for this product. We advise you to consult with your healthcare provider before starting any new supplement, especially one where key data is missing. Choose a product with transparent, evidence-backed labeling [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 120.0 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