NOW Magnesium Bisglycinate Powder
Brand: NOW · Form: POWDER [E0162]
Our assessment
The evidence shows that NOW Magnesium Bisglycinate Powder is a well-absorbed form of magnesium designed to support muscle relaxation and nerve function. As a clinical pharmacist, I can tell you that magnesium bisglycinate is often preferred because it is gentle on the stomach and highly bioavailable. However, it is essential to note that this product contains calcium as well, which brings important considerations for your health.
How it works
Think of magnesium as a natural relaxant for your muscles and nervous system. It helps support neuromuscular relaxation and nerve signaling [NIH ODS]. The calcium in this powder contributes to bone mineralization and supports bone density [NIH ODS]. Together, these two minerals work in concert to maintain proper muscle function and skeletal health.
Safety profile
FDA received 592,059 total adverse event reports for this product category. Regarding calcium, 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]. Additionally, calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].
Our recommendation
Start with a single scoop mixed in water or your favorite beverage, ideally in the evening to support relaxation. If you take thyroid medication or antibiotics, separate this supplement by at least two hours to avoid absorption issues [NIH ODS]. Given the calcium content, monitor your total daily calcium intake from all sources. If you have a history of kidney stones, heart disease, or prostate cancer risk, consult your doctor before use [NIH ODS].
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