Vitacost L-Lysine, 1000 mg supplement bottle
Vitacost

L-Lysine, 1000 mg Review

What We Researched
2 active ingredients analyzed · 7 inactive ingredients decoded · 7 brand certifications checked · Last updated: Aug 2026
93
Product Score Excellent
84
Brand Score Good

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
Vitamin B6 (as pyridoxine hydrochloride) 25 mg 1,471%
L-Lysine (as L-lysine HCl) 1000 mg *
Bioavailability Very Good

Absorption Rating

  • Vitamin B6 (as pyridoxine hydrochloride) Fair
  • L-Lysine (as L-lysine HCl) Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Vegetable Magnesium Stearate
  • Croscarmellose Sodium
  • Hypromellose
  • Vegetable Glycerin
  • Vegetable Stearic Acid
  • Silicon Dioxide
Efficacy Excellent

Dosage Analysis

  • Vitamin B6 (as pyridoxine hydrochloride) 25 mg Effective
  • L-Lysine (as L-lysine HCl) 1000 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Vitamin B6 (as pyridoxine hydrochloride) 25 mg 1,471%
L-Lysine (as L-lysine HCl) 1000 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.

Vegetable Magnesium Stearate Safe

Prevents ingredients from sticking to equipment. Derived from vegetable sources.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Vegetable Glycerin Safe

Helps form softgel capsule shells and acts as a humectant.

Vegetable Stearic Acid Generally_safe

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

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Brand Trust Report
Vitacost

Founded 1994 · Boca Raton, Florida, United States · 218 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

4 claims
Third Party Testing Claim — Claimed Source
In House Testing — Claimed Source
Contains Proprietary Blend — True

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, 1000 mg a good supplement?

Vitacost L-Lysine, 1000 mg received a product quality score of 93/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 2 active ingredients with 250 servings per container. Of the 7 inactive ingredients, 6 are rated safe and 0 are flagged for review. The manufacturer, Vitacost, holds a brand trust score of 84/100 with 7 verified certifications including Consumerlab, Informed Sport, Nsf Certified For Sport, Gluten Free Gfco.

What are the ingredients in Vitacost L-Lysine, 1000 mg?

Vitacost L-Lysine, 1000 mg contains 2 active ingredients: Vitamin B6 (as pyridoxine hydrochloride) (25 mg), L-Lysine (as L-lysine HCl) (1000 mg). Notable high-dose ingredients include Vitamin B6 at 1,471% DV. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Vitacost L-Lysine, 1000 mg safe to take?

Vitacost L-Lysine, 1000 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 Vitacost a trustworthy supplement brand?

Vitacost receives a brand trust score of 84/100 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 218 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 — 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.