Vitacost L-Lysine, 500 mg, 300 Tablets supplement bottle
Vitacost

L-Lysine, 500 mg, 300 Tablets

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 7 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
75
Product Score Fair
71
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
L-Lysine (as L-Lysine HCI) 500 mg *
Bioavailability Excellent

Absorption Rating

  • L-Lysine (as L-Lysine HCI) Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Dicalcium Phosphate
  • Stearic Acid
  • Calcium silicate and magnesium stearate
Efficacy Very Poor

Dosage Analysis

  • L-Lysine (as L-Lysine HCI) 500 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
L-Lysine (as L-Lysine HCI) 500 mg *

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

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

Dicalcium Phosphate Safe

Serves as both a filler and a supplemental source of calcium and phosphorus.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Calcium silicate and magnesium stearate Unknown

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$17$16$15$14$13 Mar 12 $14.99
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
Vitacost

Founded 1994 · Boca Raton, Florida, United States · 119 products · vitacost.com

Certifications

7 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Nsf Certified For Sport Verified Source
Gluten Free Gfco Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source

Transparency

3 claims
Third Party Testing Claim — Claimed Source
In House Testing — Claimed Source

Violation History

5 incidents
Recall Navitas Organics - Organic Chia Seeds, 8oz2026-01-23Source
Prop 65 Lead2024-02-08Source
Prop 65 Lead2020-08-05Source
Lawsuit Mislabeled magnesium content in supplements, failing to list magnesium oxide as an ingredient.2016Source
Lawsuit Breach of fiduciary duties by the board of directors in relation to the acquisition by Kroger.2014Source
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Frequently Asked Questions
Is Vitacost L-Lysine, 500 mg a good supplement?

Vitacost L-Lysine, 500 mg, 300 Tablets received a product quality score of 75/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 1 active ingredients with 300 servings per container. Of the 4 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Vitacost, holds a brand trust score of 71/100 with 7 verified certifications including Consumerlab, Informed Sport, Nsf Certified For Sport, Gluten Free Gfco.

What are the ingredients in Vitacost L-Lysine, 500 mg?

Vitacost L-Lysine, 500 mg contains 1 active ingredients: L-Lysine (as L-Lysine HCI) (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Vitacost L-Lysine, 500 mg safe to take?

Vitacost L-Lysine, 500 mg, 300 Tablets 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 Vitacost a trustworthy supplement brand?

Vitacost receives a brand trust score of 71/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1994 and headquartered in Boca Raton, Florida, United States, the company offers 119 products in their lineup. They hold 7 verified certifications including Consumerlab, Informed Sport, Nsf Certified For Sport, Gluten Free Gfco. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Vitacost 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. 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.