Natrol Acidophilus Probiotic supplement bottle
Natrol

Acidophilus Probiotic Review

What We Researched
1 active ingredient analyzed · 6 inactive ingredients decoded · 7 brand certifications checked · Last updated: Aug 2026
100
Product Score Excellent
96
Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Lactobacillus acidophilus 100 mg
Bioavailability Excellent

Absorption Rating

  • Lactobacillus acidophilus Good
Other Ingredients Excellent

Fillers & Additives

  • Magnesium Stearate
  • Gelatin
  • Microcrystalline Cellulose
  • Whey Powder
  • Silica
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • Lactobacillus acidophilus 100 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Lactobacillus acidophilus 100 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Whey Powder Generally_safe

It is used as a filler or binder.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
Natrol

Founded 1980 · Chatsworth, California, USA · 319 products · natrol.com

Certifications

7 certifications
Consumerlab Verified Source
Npa Gmp Verified Source
Fda Gmp Inspections Verified Source
Nsf Gmp Verified Source
USP Verified Verified
IGEN Non-GMO Tested Verified
NSF Certified Verified

Transparency

5 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed Source
In House Testing — Verified Source
Contains Proprietary Blend — True

Violation History

8 incidents
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Lawsuit False and deceptive claims about the memory-improving capabilities of Cognium supplements.2021Source
Fda Warning Public health warning against the purchase and consumption of unregistered food supplements.2020-07-21Source
Lawsuit Claims that their biotin products were ineffective.2017Source
Lawsuit Falsely advertising the joint health benefits of their glucosamine and chondroitin products.2013Source
Lawsuit Deceptive marketing claims regarding L-Arginine supplements.2013Source
Prop 65 Not specified in the article2002-04-22Source
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Frequently Asked Questions
Is Natrol Acidophilus Probiotic a good supplement?

Natrol Acidophilus Probiotic received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients with 100 servings per container. Of the 6 inactive ingredients, 5 are rated safe and 0 are flagged for review. The manufacturer, Natrol, holds a brand trust score of 96/100 with 7 verified certifications including Consumerlab, Npa Gmp, Fda Gmp Inspections, Nsf Gmp.

What are the ingredients in Natrol Acidophilus Probiotic?

Natrol Acidophilus Probiotic contains 1 active ingredients: Lactobacillus acidophilus (100 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natrol Acidophilus Probiotic safe to take?

Natrol Acidophilus Probiotic has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Natrol a trustworthy supplement brand?

Natrol receives a brand trust score of 96/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1980 and headquartered in Chatsworth, California, USA, the company offers 319 products in their lineup. They hold 7 verified certifications including Consumerlab, Npa Gmp, Fda Gmp Inspections, Nsf Gmp. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Natrol has 8 historical regulatory incidents on record, which are factored into the trust score.

Do probiotics make you poop?

The effects of supplements on the body vary based on the specific ingredients, dosages, and individual factors. Quality clinical research is the best guide for understanding what supplements actually do versus marketing claims. Be cautious of products that promise dramatic results — legitimate supplements support health gradually, not overnight. Checking the ingredient label, understanding the dosages, and reviewing the scientific evidence are essential steps before starting any supplement. GoodSupp evaluates over 150,000 products based on published research and evidence-based criteria.

What are probiotics good for?

Probiotics Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding probiotics good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 150,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

Do probiotics help with constipation?

This is an important question for supplement consumers. The dietary supplement industry is largely self-regulated, which means product quality, ingredient transparency, and safety practices vary significantly between brands and products. The most reliable way to evaluate any supplement is to check for third-party testing certifications, review the full ingredient list and dosages, and research the brand's regulatory track record. GoodSupp's database of over 150,000 analyzed products provides independent quality scores, ingredient safety ratings, and brand trust reports to help you make evidence-based decisions.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.