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Member's Mark Magnesium Glycinate with L-Theanine supplement bottle
Member's Mark

Magnesium Glycinate with L-Theanine Review

What We Researched
3 active ingredients analyzed · 12 inactive ingredients decoded · 5 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
96
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

IngredientAmount% DV
Magnesium Glycinate 200 mg —
Magnesium 200 mg —
L-Theanine 200 mg —
Bioavailability Excellent

Absorption Rating

  • Magnesium Glycinate Good
  • Magnesium Good
  • L-Theanine Good
Other Ingredients Excellent

Fillers & Additives

  • Crospovidone
  • Microcrystalline Cellulose
  • Carnauba Wax
  • Croscarmellose Sodium
  • Hypromellose
  • Magnesium Stearate
  • Medium Chain Triglycerides
  • Hydroxypropyl Cellulose
  • Stearic Acid
  • Isomalt
  • Starch
  • Silica
Efficacy Excellent

Dosage Analysis

  • Magnesium Glycinate 200 mg Effective
  • Magnesium 200 mg Effective
  • L-Theanine 200 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Magnesium Glycinate 200 mg
Magnesium 200 mg
L-Theanine 200 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Crospovidone Generally_safe

It is used as a binder to help tablets or capsules disintegrate.

Microcrystalline Cellulose Safe

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

Carnauba Wax Safe

Provides a glossy, protective coating on tablets.

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Medium Chain Triglycerides Safe

Enhances absorption of fat-soluble vitamins.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Isomalt Generally_safe

It provides sweetness with fewer calories than sugar.

Starch Generally_safe

It is used as a filler, binder, or thickener.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Brand Trust Report
Member's Mark

Founded 1998 · Bentonville, Arkansas, USA · 76 products · samsclub.com/c/members-mark/7230141

Certifications

5 certifications
Consumerlab Source available Primary evidence
Usda Organic Source available Primary evidence
Vegan Certified Source available Primary evidence
USP Verified Supporting evidence unavailable
Non-GMO Project Verified Supporting evidence unavailable

Transparency

3 claims
Third Party Testing Claim — Claimed Brand claim; evidence unavailable
Contains Proprietary Blend — True Brand claim; evidence unavailable

Violation History

1 incident
Lawsuit The lawsuit alleges that the product was falsely advertised as containing 500 mg of 'standardized extract' of 'turmeric curcumin complex' with '95% Standardized Turmeric (Curcuma longa) Extract,' implying 475 mg of curcuminoids. However, testing by ConsumerLab.com reportedly found only 9.7 mg of curcuminoids per serving.2023 Source available Primary source
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Frequently Asked Questions
Is Member's Mark Magnesium Glycinate with L-Theanine a good supplement?

Member's Mark Magnesium Glycinate with L-Theanine 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 3 active ingredients with 90 servings per container. All 12 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Member's Mark, holds a brand trust score of 96/100.

What are the ingredients in Member's Mark Magnesium Glycinate with L-Theanine?

Member's Mark Magnesium Glycinate with L-Theanine contains 3 active ingredients: Magnesium Glycinate (200 mg), Magnesium (200 mg), L-Theanine (200 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Member's Mark Magnesium Glycinate with L-Theanine safe to take?

GoodSupp reviewed the inactive-ingredient data available for Member's Mark Magnesium Glycinate with L-Theanine. All 12 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 Member's Mark a trustworthy supplement brand?

Member's Mark receives a brand trust score of 96/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1998 and headquartered in Bentonville, Arkansas, USA, the company offers 76 products in their lineup. Note: Member's Mark has 1 historical regulatory incident 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.