NOW Iron 18 mg
Brand: NOW · Form: CAPSULE [E0159]
Our assessment
The evidence shows that calcium is a critical mineral for bone health, but the data on supplementation requires careful consideration. For a product like NOW Iron 18 mg, which does not contain calcium, this analysis is based on the calcium data provided. Our assessment is that calcium plays a fundamental role in bone mineralization and neuromuscular function, but the risks associated with high intake are significant and often overlooked [NIH ODS].
How it works
Think of calcium as a structural building block for your bones and a key signaling molecule for your nerves and muscles. It supports bone density through mineralization and helps your muscles relax and nerves send signals properly [NIH ODS].
Safety profile
FDA received a total of 592,059 adverse event reports across all supplements, but specific report counts for calcium side effects are not available. The data warns that high calcium intakes might increase the risk of heart disease and prostate cancer. 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 urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS].
Our recommendation
Do not take calcium supplements without first assessing your dietary intake and discussing with your doctor. If you are taking medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, or phenytoin, calcium can reduce their absorption, so separate dosing is critical [NIH ODS]. For this NOW Iron 18 mg product, data on iron-specific benefits and risks is not provided, so we cannot make a recommendation for that ingredient.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 120.0 Veg 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