Rexall Quick Dissolve Melatonin 10 mg
Brand: Rexall · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that Rexall Quick Dissolve Melatonin 10 mg contains calcium as a key ingredient. Our assessment: calcium is a well-studied mineral, but the 10 mg melatonin dose is significantly higher than the typical 0.5–5 mg range used for sleep support. You should be aware of both the benefits and the specific risks associated with calcium, as well as the high melatonin content.
How it works
Think of calcium as a dual-function regulator. It supports bone mineralization by helping deposit minerals into your bone structure, and it aids neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS]. For melatonin, the quick-dissolve format is designed to be absorbed rapidly under your tongue, which may help you fall asleep faster.
Safety profile
Data not available for this specific product's adverse events. However, FDA has received a total of 592,059 adverse event reports across all supplement categories [FDA data]. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. High levels of calcium in the blood and urine can cause 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 several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start with caution. The 10 mg melatonin dose is very high — most adults should begin with 1–3 mg. If you are taking any medications listed above (such as thyroid medication or antibiotics), take this product at least 2 hours apart from those drugs. Do not exceed the label dose, and consult your doctor before use if you have a history of kidney stones, heart disease, or prostate cancer [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Rexall |
|---|---|
| Serving Size | |
| Contents | 30.0 Tablet(s) |
| Market Status | On 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