Rexall Magnesium 500 mg
Brand: Rexall · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that Rexall Magnesium 500 mg is a straightforward supplement, but you need to be aware of the potential interactions and safety concerns associated with the calcium found in this product. Data for the specific magnesium content is not available for a full assessment of this ingredient alone.
How it works
This product contains calcium, which acts as a master regulator for your body. It supports bone mineralization by helping deposit minerals into bone density, and it also aids neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS].
Safety profile
FDA received 592,059 total adverse event reports for this product’s ingredients. Side effects from high calcium intake include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [FDA data] [NIH ODS]. High calcium intakes might also increase the risk of heart disease and prostate cancer [NIH ODS]. Calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Our recommendation: Before taking this supplement, review all your medications with your pharmacist due to the significant interaction risk with calcium [NIH ODS]. Be cautious about your total daily calcium intake from all sources, and do not exceed recommended levels to avoid serious side effects [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