Doctor's Best L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) supplement bottle
Doctor's Best

L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap)

What We Researched
1 active ingredient analyzed · 3 inactive ingredients decoded · 1 brand certification checked · 4 retailers compared · Last updated: Mar 2026
87
Product Score Good
61
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Carnitine (from L-Carnitine Fumarate) 500 mg
Bioavailability Fair

Absorption Rating

  • L-Carnitine (from L-Carnitine Fumarate) Fair
Other Ingredients Excellent

Fillers & Additives

  • Hypromellose (Vegetarian Capsule)
  • Magnesium Stearate (Vegetable Source)
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • L-Carnitine (from L-Carnitine Fumarate) 500 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Carnitine (from L-Carnitine Fumarate) 500 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Hypromellose (Vegetarian Capsule) Safe

It is used as a material for making vegetarian capsules.

Magnesium Stearate (Vegetable Source) Generally_safe

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

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$22$21$20$19$18 Mar 12 $19.99$19.99
iHerb
Vitacost

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Doctor's Best

Founded 1990 · Tustin, California, USA · 186 products · doctorsbest.com

Certifications

1 certification
Fda Gmp Inspections Verified Source

Transparency

2 claims
Third Party Testing Claim — Claimed Source

Violation History

1 incident
Recall Red Yeast Rice2014-06-26Source
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Frequently Asked Questions
Is Doctor's Best L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) a good supplement?

Doctor's Best L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) received a product quality score of 87/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 1 active ingredients Of the 3 inactive ingredients, 2 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 L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap)?

Doctor's Best L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) contains 1 active ingredients: L-Carnitine (from L-Carnitine Fumarate) (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Doctor's Best L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) safe to take?

Doctor's Best L-Carnitine Fumarate with Biosint Carnitine, 60 Veggie Caps (500 mg per Veggie Cap) 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 186 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 1 historical regulatory incident 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. 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.