NOW Magnesium Bisglycinate Powder
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that NOW Magnesium Bisglycinate Powder is a supplement formulated to provide magnesium, a mineral essential for many bodily functions. However, the specific data provided here focuses on calcium, not magnesium. Based on the data we have, we cannot make specific claims about magnesium bisglycinate itself. For calcium, which is a different mineral, the data confirms a role in bone mineralization and neuromuscular relaxation [NIH ODS]. We must be clear that the information below applies to calcium, as no data was provided for magnesium.
How it works
Think of calcium as a structural and signaling mineral. It supports bone density and mineral deposition, which is how your skeleton stays strong. It also plays a key role in neuromuscular relaxation, helping your muscles and nerves communicate properly [NIH ODS]. Please note, this mechanism description is based on the calcium data provided, not on magnesium bisglycinate.
Safety profile
For calcium, the FDA has received a total of 592,059 adverse event reports across all supplements [FDA data]. Specific side effects from high calcium intake include constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, and abnormal heart rhythms [NIH ODS]. High levels of calcium in the blood and urine can also cause poor muscle tone, poor kidney function, low phosphate levels, and a high risk of death from heart disease [NIH ODS]. Some research also suggests that high calcium intakes might 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]. Data for the safety profile of magnesium bisglycinate is not available.
Our recommendation
Based solely on the data provided, we cannot recommend NOW Magnesium Bisglycinate Powder because the available information is about calcium, not magnesium. For calcium, the data supports its role in bone health, but we caution that high intakes carry significant risks and interactions [NIH ODS] [FDA data]. Because the data for this specific product's active ingredient—magnesium bisglycinate—is missing, our recommendation is to seek product-specific information from a healthcare professional or the manufacturer. We cannot make a confident recommendation for this supplement based on the data provided.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 8.0 oz. 227.0 Gram(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