Product Label

Jarrow Formulas Prebiotic Soluble Fiber Inulin Fos

Brand: Jarrow Formulas · Form: POWDER [E0162]

Our assessment

Our assessment is that this product contains calcium, a mineral essential for bone health, but the evidence does not support using it as a prebiotic fiber supplement. The data shows calcium's primary role is in bone mineralization and neuromuscular relaxation [NIH ODS]. You should not expect this product to function as a prebiotic fiber based on the available data.

How it works

Calcium works as a structural component for your bones and teeth, supporting bone density and mineral deposition. It also plays a key role in neuromuscular relaxation by supporting muscle relaxation and nerve signaling [NIH ODS]. Think of it as the building block your body uses to keep your skeleton strong and your nerves communicating properly.

Safety profile

Data not available for this specific product's side effects. However, the FDA has received 592,059 total adverse event reports across all supplement categories. For calcium specifically, high 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 need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Calcium can also reduce absorption of medications like bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS].

Our recommendation

Our recommendation is to avoid using this product as a prebiotic fiber supplement. The evidence shows it is a calcium supplement, not a prebiotic. If you need calcium, get it from food sources first and talk to your doctor before supplementing. Be aware of the serious risks associated with high calcium intake and potential medication interactions [NIH ODS].

AI-assisted analysis. Data sourced from NIH DSLD.

Supplement Facts

BrandJarrow Formulas
Serving Size
Contents6.3 oz. 180.0 Gram(s)
Market StatusOff 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

Original Label

View Full DSLD Label (PDF)

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