21st Century MgO 400 mg
Brand: 21st Century · Form: TABLET [E0155] On Market
Our assessment
The evidence shows that 21st Century MgO 400 mg is a straightforward magnesium supplement. However, based on the data provided, we can only assess the ingredient calcium, which is not listed in the product's ingredient list. For the product itself, data on its specific effects, benefits, and risks are not available. We will focus on the general principles of mineral supplementation, but you should be aware that specific data for this product is missing.
How it works
Calcium supports bone density and mineral deposition through a process called bone mineralization [NIH ODS]. It also plays a key role in neuromuscular relaxation, helping your muscles relax and your nerves signal properly [NIH ODS]. Think of calcium as a structural and signaling mineral—it builds your skeleton and helps your body's communication systems function smoothly.
Safety profile
FDA received 592,059 total adverse event reports across all supplements, though specific reports for this product are not available. For calcium, some research suggests that high intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. 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]. Calcium can also reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Data not available for this specific product. Without complete information on the product's ingredients and their exact dosages, we cannot make a confident recommendation. If you are considering this supplement, consult with your healthcare provider to ensure it is appropriate for your individual health needs and to check for potential interactions with any medications you take.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 90.0 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