Dr. Mercola Magnesium L-Threonate
Brand: Dr. Mercola · Form: CAPSULE [E0159] On Market
Our assessment
The evidence shows that Dr. Mercola Magnesium L-Threonate contains calcium as an ingredient. Our assessment is that you should be cautious with this supplement, as the data on calcium is complex and carries significant risks. While the product is marketed for magnesium, the included calcium requires your attention. The key finding is that high calcium intake may increase the risk of heart disease and prostate cancer [NIH ODS].
How it works
Calcium plays a role in bone mineralization, supporting bone density and mineral deposition, and it also aids in neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS]. However, you should be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Safety profile
FDA has received a total of 592,059 adverse event reports for products in this category. For the calcium component specifically, high levels 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] [FDA data].
Our recommendation
We recommend that you consult your healthcare provider before taking this supplement, especially if you take any prescription medications. Data not available on the exact dose of calcium per serving, so you cannot accurately track your total intake. Choose a magnesium-only supplement if your goal is to increase magnesium without the potential risks of added calcium [NIH ODS].
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | Dr. Mercola |
|---|---|
| Serving Size | |
| Contents | 90.0 Capsule(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