BioStacks
Kirkland Signature

Psyllium Fiber Powder

Powder · 1 Teaspoon (5.8g) · 360 servings

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What it does

A combination of 5 label ingredients.

Psyllium Husk

Form not confirmedGrade —

Can improve bowel frequency and stool consistency in adults with constipation; benefit depends on amount and appropriate fluid intake.

Iron

Form not confirmedGrade —

Supports hemoglobin production and oxygen transport; extra iron does not automatically improve energy when iron status is adequate.

Digestion
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Ingredients (4)

IngredientDoseTarget/referenceForm

Iron

0.4 mg

Trace amount — not scored

Nutrition

Calories, macros & sodium.

  • Sodium5 mg

Other ingredients

Artificial ColorsColorant

May trigger hyperactivity in sensitive children; potential link to allergic reactions

AspartameSweetener

Classified by IARC as Group 2B (possibly carcinogenic to humans) in July 2023 based on limited evidence of hepatocellular carcinoma. JECFA simultaneously reaffirmed the 40 mg/kg/day ADI as safe. MANDATORY FDA WARNING: contains phenylalanine — contraindicated in phenylketonuria (PKU). Anecdotal headache/migraine reports in sensitive individuals are documented but mechanism is unclear. The additive is purely cosmetic — risk:benefit unfavorable for any supplement.

MaltodextrinBinder

Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.

Artificial FlavorsFlavor

Composition is proprietary and not disclosed on the label, so allergens or solvents cannot be verified. Naturally flavored alternatives are more transparent.

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Citric AcidAcidulant

Natural acid derived from citrus fruits

Lab testing

How to take it

With food
Keep it away from medication and mineral supplements

On the label

Mix 1 teaspoon in your favorite beverage or recipe.

Price check

$51.84

$0.14 / serving

$20$50

Pricier than 84% of 108 digestion supplements

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

Not medical advice. Consult your healthcare professional.

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