Get the App
Sundown L-Lysine 1000 mg supplement bottle
Sundown

L-Lysine 1000 mg Review

What We Researched
1 active ingredient analyzed · 1 inactive ingredient decoded · 3 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
81
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
L-Lysine (as L-Lysine Hydrochloride) 1000 mg †
Bioavailability Excellent

Absorption Rating

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

Fillers & Additives

  • Vegetable Cellulose
Efficacy Excellent

Dosage Analysis

  • L-Lysine (as L-Lysine Hydrochloride) 1000 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Lysine (as L-Lysine Hydrochloride) 1000 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Vegetable Cellulose Safe

Forms a vegetarian capsule shell alternative to gelatin.

Brand Trust Report
Sundown

Founded 1977 · Bridgewater, NJ, USA · 359 products · sundownnutrition.com/

Certifications

3 certifications
Consumerlab Source available Primary evidence
Nsf Gmp Source available Primary evidence
Usda Organic Source available Primary evidence

Transparency

3 claims
Third Party Testing Claim — Claimed Evidence available Evidence
In House Testing — Claimed Evidence available Evidence

Violation History

9 incidents
Lawsuit FTC charges of 'review hijacking' on Amazon to mislead consumers.2023 Source available Primary source
Lawsuit Deceptive 'review hijacking' on Amazon to mislead consumers about product ratings and popularity.2023 Source available Primary source
Lawsuit The Bountiful Company, including Sundown Naturals, engaged in 'review hijacking' on Amazon.com to deceive consumers.2023 Source available Primary source
Lawsuit Deceptive labeling of 'Complete' multivitamins that were missing essential B vitamins.2021 Source available Primary source
Lawsuit A class-action lawsuit was filed against Rexall Sundown, Inc., NatureSmart, LLC, and The Bountiful Company for misrepresenting 'Complete' multivitamin gummies that lacked all essential B vitamins.2021 Source available Primary source
Lawsuit Rexall Sundown, Inc. faced a class-action lawsuit for allegedly mislabeling joint health products.2017 Source available Primary source
Recall Rexall Calcium 1200 mg plus 1000IU Vitamin D3, 60 softgels2012-01-16 Source available Primary source
Lawsuit The FTC charged Rexall Sundown, Inc. with making misleading claims about its Cellasene product.2003 Source available Primary source
Lawsuit False and unsubstantiated claims for the 'Cellasene' supplement.2000 Source available Primary source
Related Supplements
Tru Niagen Tru Niagen Pro 1000 mg
Tru Niagen Tru Niagen Pro 1000 mg
Product 100 Brand 100
Jamieson Extra Strength D3 2500 IU
Jamieson Extra Strength D3 2500 IU
Product 100 Brand 100
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Gaia Herbs Hibiscus Flower Liquid Phyto-Caps
Product 100 Brand 100
Sundown Biotin 1000 MCG Gummies
Sundown Biotin 1000 MCG Gummies
Product 100 Brand 81
Sundown Astaxanthin 5 mg
Sundown Astaxanthin 5 mg
Product 100 Brand 81
Sundown Milk Thistle 240 mg
Sundown Milk Thistle 240 mg
Product 100 Brand 81
Frequently Asked Questions
Is Sundown L-Lysine 1000 mg a good supplement?

Sundown L-Lysine 1000 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 All 1 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Sundown, holds a brand trust score of 81/100.

What are the ingredients in Sundown L-Lysine 1000 mg?

Sundown L-Lysine 1000 mg contains 1 active ingredients: L-Lysine (as L-Lysine Hydrochloride) (1000 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Sundown L-Lysine 1000 mg safe to take?

GoodSupp reviewed the inactive-ingredient data available for Sundown L-Lysine 1000 mg. All 1 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 Sundown a trustworthy supplement brand?

Sundown receives a brand trust score of 81/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1977 and headquartered in Bridgewater, NJ, USA, the company offers 359 products in their lineup. Note: Sundown has 9 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.