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Solgar L-Cysteine 500 mg supplement bottle
Solgar

L-Cysteine 500 mg Review

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 4 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
78
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
L-Cysteine (as L-cysteine HCl) (Free Form) 500 mg **
Bioavailability Excellent

Absorption Rating

  • L-Cysteine (as L-cysteine HCl) (Free Form) Good
Other Ingredients Excellent

Fillers & Additives

  • Vegetable Cellulose
  • Vegetable Magnesium Stearate
  • Silica
  • Microcrystalline Cellulose
Efficacy Excellent

Dosage Analysis

  • L-Cysteine (as L-cysteine HCl) (Free Form) 500 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
L-Cysteine (as L-cysteine HCl) (Free Form) 500 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Vegetable Cellulose Safe

Forms a vegetarian capsule shell alternative to gelatin.

Vegetable Magnesium Stearate Safe

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

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Microcrystalline Cellulose Safe

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

Brand Trust Report
Solgar

Founded 1947 · Leonia, New Jersey, United States · 295 products · solgar.com

Certifications

4 certifications
Halal Certified Source available Primary evidence
Kosher Certified Source available Primary evidence
Non-GMO Project Verified Supporting evidence unavailable
Gluten-Free Certified Supporting evidence unavailable

Transparency

4 claims
Third Party Testing Claim — Claimed Brand claim; evidence unavailable
In House Testing — Verified Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable
Contains Proprietary Blend — True Brand claim; evidence unavailable
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Frequently Asked Questions
Is Solgar L-Cysteine 500 mg a good supplement?

Solgar L-Cysteine 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 All 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Solgar, holds a brand trust score of 78/100.

What are the ingredients in Solgar L-Cysteine 500 mg?

Solgar L-Cysteine 500 mg contains 1 active ingredients: L-Cysteine (as L-cysteine HCl) (Free Form) (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Solgar L-Cysteine 500 mg safe to take?

GoodSupp reviewed the inactive-ingredient data available for Solgar L-Cysteine 500 mg. All 4 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 Solgar a trustworthy supplement brand?

Solgar receives a brand trust score of 78/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1947 and headquartered in Leonia, New Jersey, United States, the company offers 295 products in their lineup.

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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.