Doctor's Best Acetyl-L-Carnitine 500 mg supplement bottle
Doctor's Best

Acetyl-L-Carnitine 500 mg Review

What We Researched
1 active ingredient analyzed · 7 inactive ingredients decoded · 1 brand certification checked · Last updated: Aug 2026
100
Product Score Excellent
61
Brand Score Fair

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 (from acetyl-l-carnitine HCl) 1000 mg †
Bioavailability Excellent

Absorption Rating

  • Acetyl-L-Carnitine (from acetyl-l-carnitine HCl) Good
Other Ingredients Excellent

Fillers & Additives

  • Magnesium Silicate
  • Microcrystalline Cellulose
  • Hypromellose
  • Stearic Acid
  • Silica
  • Modified Cellulose
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • Acetyl-L-Carnitine (from acetyl-l-carnitine HCl) 1000 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Acetyl-L-Carnitine (from acetyl-l-carnitine HCl) 1000 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Magnesium Silicate Generally_safe

It is used to improve powder flow and prevent clumping.

Microcrystalline Cellulose Safe

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

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Modified Cellulose Safe

Creates vegetarian capsule shells with controlled dissolution.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
Doctor's Best

Founded 1990 · Tustin, California, USA · 351 products · doctorsbest.com

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source

Violation History

3 incidents
Lawsuit False advertising and mislabeling of glucosamine supplements.2022Source
Recall Red Yeast Rice2014-06-26Source
Recall Red Yeast Rice 600 mg Capsules, 120-count bottles2014-06-24Source
Related Supplements
Sports Research Creatine Monohydrate
Sports Research Creatine Monohydrate
Product 100 Brand 100
Nutricost Creatine Monohydrate (Shaq's Berry Blast
Nutricost Creatine Monohydrate (Shaq's Berry Blast
Product 100 Brand 100
NOW Creatine Monohydrate Powder
NOW Creatine Monohydrate Powder
Product 100 Brand 100
Doctor's Best Citicoline CDP-Choline
Doctor's Best Citicoline CDP-Choline
Product 100 Brand 61
Doctor's Best High Absorption Magnesium 100% Chelated
Doctor's Best High Absorption Magnesium 100% Chelated
Product 100 Brand 61
Doctor's Best SAM-e, 400 mg
Doctor's Best SAM-e, 400 mg
Product 100 Brand 61
Frequently Asked Questions
Is Doctor's Best Acetyl-L-Carnitine 500 mg a good supplement?

Doctor's Best Acetyl-L-Carnitine 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 60 servings per container. Of the 7 inactive ingredients, 6 are rated safe and 0 are flagged for review. The manufacturer, Doctor's Best, holds a brand trust score of 61/100 with 1 verified certifications including Fda Gmp Inspections.

What are the ingredients in Doctor's Best Acetyl-L-Carnitine 500 mg?

Doctor's Best Acetyl-L-Carnitine 500 mg contains 1 active ingredients: Acetyl-L-Carnitine (from acetyl-l-carnitine HCl) (1000 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Doctor's Best Acetyl-L-Carnitine 500 mg safe to take?

Doctor's Best Acetyl-L-Carnitine 500 mg 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 Doctor's Best a trustworthy supplement brand?

Doctor's Best receives a brand trust score of 61/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1990 and headquartered in Tustin, California, USA, the company offers 351 products in their lineup. They hold 1 verified certifications including Fda Gmp Inspections. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Doctor's Best has 3 historical regulatory incidents on record, which are factored into the trust score.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

Download on App Store Browse All Supplements
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.