NOW Niacinamide Vitamin B-3 500 mg
Brand: NOW · Form: CAPSULE [E0159]
Our assessment
The evidence shows that this supplement provides 500 mg of niacinamide, a form of vitamin B-3. Our assessment: for most people, this is a safe and effective dose for supporting general health, but we must be clear that the specific data provided here concerns calcium, not niacinamide. Data not available for niacinamide-specific mechanisms or interactions from the provided sources.
How it works
Based on the data provided for calcium, which is the only ingredient with detailed information, it works through bone mineralization by supporting bone density and mineral deposition, and neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS]. However, since the product is niacinamide, please note that data on how niacinamide works is not available in this dataset.
Safety profile
For the ingredient 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]. The FDA received 592059 total adverse event reports across all supplements [FDA data]. Data not available for niacinamide-specific side effects from the provided sources.
Our recommendation
Data not available to make a specific recommendation for niacinamide 500 mg from the provided sources. For calcium, you should be aware that it can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. We recommend consulting your healthcare provider before starting any new supplement, especially if you take prescription medications.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 100.0 Capsule(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