GNC L-Glutamine Unflavored supplement bottle

GNC

L-Glutamine Unflavored Review

Q: What are the ingredients in GNC L-Glutamine Unflavored?

GNC L-Glutamine Unflavored contains 1 active ingredients: L-Glutamine (5 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Q: Is GNC a trustworthy supplement brand?

GNC receives a brand trust score of 96/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1935 and headquartered in Pittsburgh, Pennsylvania, USA, the company offers 1590 products in their lineup. Note: GNC has 34 historical regulatory incidents on record, which are factored into the trust score.

What We Researched

1 active ingredient analyzed · 10 brand certifications checked · Page generated: Sep 2026

100

Product Score Excellent

Brand Score Excellent

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

Ingredient	Amount	% DV
L-Glutamine	5 g	†

Bioavailability Excellent

Absorption Rating

L-Glutamine Good

Other Ingredients Excellent

Fillers & Additives

No inactive ingredient data available.

Efficacy Excellent

Dosage Analysis

L-Glutamine 5 g Effective

Supplement Facts

Ingredient	Amount	% Daily Value
L-Glutamine	5 g	†

Brand Trust Report

Certifications

10 certifications

Informed Sport Source available Primary evidence

Nsf Certified For Sport Source available Primary evidence

Clean Label Project Source available Primary evidence

Labdoor Source available Primary evidence

Consumerlab Source available Primary evidence

Fda Gmp Inspections Source available Primary evidence

Usda Organic Source available Primary evidence

Vegan Certified Source available Primary evidence

Nsf Gmp Source available Primary evidence

Informed Choice Supporting evidence unavailable checked 2026-05-05

Transparency

5 claims

Third Party Testing Claim — Verified Evidence available Evidence

Testing Lab Disclosure — Verified Evidence available Evidence

In House Testing — Claimed Brand claim; evidence unavailable

Contains Proprietary Blend — True Brand claim; evidence unavailable checked 2026-05-05

Violation History

34 incidents

Prop 65 Not specified on product pageOngoing Source available Primary source

Recall GNC Women's 30+ Vitapak2025-06-13 Source available Primary source

Recall GNC Women's 30+ Vitapak2025-06-09 Source available Primary source

Recall GNC Women's 30+ Vitapak2025-06-05 Source available Primary source

Recall GNC Women's 30+ Vitapak2025-04-25 Source available Primary source

Lawsuit Misrepresentation of the amount of elemental magnesium in 'Super Magnesium' supplements.2024 Source available Primary source

Lawsuit Mislabeled magnesium content in 'Super Magnesium' supplements.2024 Source available Primary source

Lawsuit Misrepresentation of magnesium content in 'Super Magnesium' supplements.2024 Source available Primary source

Recall GNC Women's Ultra Mega, Women's Ultra Mega Active, Women's Ultra Mega Energy and Metabolism, and Prenatal Formula with Iron2023-01-12 Source available Primary source

Lawsuit Falsely advertising 'Total Lean' protein bars as 'lean'.2023 Source available Primary source

Lawsuit Selling Vitamin E Skin Oil that was primarily composed of vegetable oil.2020 Source available Primary source

Lawsuit Selling Vitamin E Skin Oil that was mostly vegetable oil.2020 Source available Primary source

Prop 65 Lead, Cadmium2019-02-07 Source available Primary source

Prop 65 Lead and/or Cadmium2019-02-07 Source available Primary source

Prop 65 Lead, Cadmium2019-02-07 Source available Primary source

Prop 65 lead and/or cadmium2019-02-07 Source available Primary source

Lawsuit Deceptively labeling dietary supplements as if they have FDA approval.2019 Source available Primary source

Lawsuit Deceptively advertising fake markdowns online to mislead consumers into thinking items were on 'sale.'2019 Source available Primary source

Lawsuit Deceptively labeling dietary supplements regarding FDA approval and failing to include required disclaimers.2019 Source available Primary source

Lawsuit Using fake 'original' prices to deceive customers.2019 Source available Primary source

Recall Women's Iron Complete Dietary Supplement 60-count caplets2018-12-19 Source available Primary source

Prop 65 Lead2018-10-12 Source available Primary source

Recall Various GNC Women's Multivitamins2018-01-04 Source available Primary source

Recall GNC Women's Ultra Mega Time Release2016-11-18 Source available Primary source

Recall GNC Women's Ultra Mega Time Release 180-count2016-11-16 Source available Primary source

Lawsuit Knowingly selling products containing unlawful synthetic chemicals (picamilon, BMPEA, and acacia rigidula).2016 Source available Primary source

Lawsuit Unfair discontinuation of the Gold Card discount program.2016 Source available Primary source

Fda Warning Inclusion of unapproved dietary ingredient Beta-methylphenethylamine (BMPEA) in products.2015-04-01 Source available Primary source

Lawsuit Mislabeling of herbal supplements2015 Source available Primary source

Lawsuit Selling products containing illegal synthetic ingredients.2015 Source available Primary source

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Frequently Asked Questions

Is GNC L-Glutamine Unflavored a good supplement?

GNC L-Glutamine Unflavored 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 with 45 servings per container. The manufacturer, GNC, holds a brand trust score of 96/100.

What are the ingredients in GNC L-Glutamine Unflavored?

GNC L-Glutamine Unflavored contains 1 active ingredients: L-Glutamine (5 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is GNC L-Glutamine Unflavored safe to take?

GoodSupp reviewed the inactive-ingredient data available for GNC L-Glutamine Unflavored. 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 GNC a trustworthy supplement brand?

GNC receives a brand trust score of 96/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1935 and headquartered in Pittsburgh, Pennsylvania, USA, the company offers 1590 products in their lineup. Note: GNC has 34 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.