21st Century Psyllium Fiber
Brand: 21st Century · Form: CAPSULE [E0159]
Our assessment
The evidence shows that 21st Century Psyllium Fiber is a source of calcium, a mineral essential for bone health. Data on the specific product is limited, but we rely on established research for its key ingredient. You should be aware that while calcium supports bone density, high intakes may carry risks [NIH ODS].
How it works
Think of calcium as a structural builder for your bones and a signal messenger for your nerves. It supports bone mineralization and helps with muscle relaxation and nerve signaling [NIH ODS].
Safety profile
The FDA has received 592,059 total adverse event reports for this product category. For calcium specifically, high levels in the blood and urine can cause poor muscle tone, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease. Some research also suggests high calcium intakes might increase the risk of heart disease and prostate cancer [FDA data] [NIH ODS].
Our recommendation
Use this product only if you need additional calcium beyond your diet. Be cautious with dosing, as calcium can reduce the absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. For personalized advice, consult your healthcare provider.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | 21st Century |
|---|---|
| Serving Size | |
| Contents | 160.0 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