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Natural Factors Acetyl-LCarnitine 500 mg supplement bottle
Natural Factors

Acetyl-LCarnitine 500 mg Review

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 5 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
100
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
Acetyl-L-Carnitine (hydrochloride) 1000 mg **
Bioavailability Excellent

Absorption Rating

  • Acetyl-L-Carnitine (hydrochloride) Good
Other Ingredients Excellent

Fillers & Additives

  • Vegetarian Capsule (Hypromellose, Purified Water)
  • Microcrystalline Cellulose
  • Magnesium Stearate (Vegetable Grade)
  • Silica
Efficacy Excellent

Dosage Analysis

  • Acetyl-L-Carnitine (hydrochloride) 1000 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Acetyl-L-Carnitine (hydrochloride) 1000 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Vegetarian Capsule (Hypromellose, Purified Water) Safe

It is used to encapsulate the supplement ingredients.

Microcrystalline Cellulose Safe

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

Magnesium Stearate (Vegetable Grade) Generally_safe

It is used to prevent ingredients from sticking to manufacturing equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Brand Trust Report
Natural Factors

Founded 1950 · Coquitlam, British Columbia, Canada · 832 products · naturalfactors.com

Certifications

5 certifications
B Corp Certified Source available Primary evidence
Usp Verified Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
Non Gmo Project Source available Primary evidence
Usda Organic Source available Primary evidence

Transparency

4 claims
Third Party Testing Claim — Verified Evidence available Evidence
Testing Lab Disclosure — Verified Evidence available Evidence
In House Testing — Verified Evidence available Evidence

Violation History

5 incidents
Prop 65 Lead2025-10-31 Source available Primary source
Recall Hi Potency B Complex, RevitalX, Super Multi® IRON FREE2024-07-19 Source available Primary source
Lawsuit Products labeled as containing glucosamine sulfate did not contain the ingredient.2021 Source available Primary source
Prop 65 Lead2016-01-13 Source available Primary source
Recall Natural Factors L-Arginine 500mg2006-04-05 Source available Primary source
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Frequently Asked Questions
Is Natural Factors Acetyl-LCarnitine 500 mg a good supplement?

Natural Factors Acetyl-LCarnitine 500 mg 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 45 servings per container. All 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Natural Factors, holds a brand trust score of 100/100.

What are the ingredients in Natural Factors Acetyl-LCarnitine 500 mg?

Natural Factors Acetyl-LCarnitine 500 mg contains 1 active ingredients: Acetyl-L-Carnitine (hydrochloride) (1000 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natural Factors Acetyl-LCarnitine 500 mg safe to take?

GoodSupp reviewed the inactive-ingredient data available for Natural Factors Acetyl-LCarnitine 500 mg. All 4 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Natural Factors a trustworthy supplement brand?

Natural Factors receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1950 and headquartered in Coquitlam, British Columbia, Canada, the company offers 832 products in their lineup. Note: Natural Factors has 5 historical regulatory incidents on record, which are factored into the trust score.

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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.