Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin, Gaba & L-Theanine, Tropical Fruit, 4.23 oz (120 g) supplement bottle
Natural Factors

Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin, Gaba & L-Theanine, Tropical Fruit, 4.23 oz (120 g)

What We Researched
7 active ingredients analyzed · 6 inactive ingredients decoded · 5 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
83
Product Score Good
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Total carbohydrates 2 g <1%‡
Magnesium (as bisglycinate) 200 mg 48%
Gamma-aminobutyric acid (GABA)(from 125 mg Pharma GABA®) 100 mg **
L-theanine 50 mg **
Melatonin 2.5 mg **
Bioavailability Good

Absorption Rating

  • Total carbohydrates Fair
  • Magnesium (as bisglycinate) Good
  • Gamma-aminobutyric acid (GABA)(from 125 mg Pharma GABA®) Poor
  • L-theanine Good
  • Melatonin Fair
Other Ingredients Excellent

Fillers & Additives

  • Citric Acid
  • Organic Tapioca Maltodextrin
  • Natural Flavors
  • Stevia Leaf Extract
  • Rice Hull Concentrate
  • Organic beetroot juice
Efficacy Very Good

Dosage Analysis

  • Magnesium (as bisglycinate) 200 mg Effective
  • Gamma-aminobutyric acid (GABA)(from 125 mg Pharma GABA®) 100 mg Effective
  • L-theanine 50 mg Under-dosed
  • Melatonin 2.5 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calories 10 g
Total carbohydrates 2 g <1%‡
Protein 1 g
Magnesium (as bisglycinate) 200 mg 48%
Gamma-aminobutyric acid (GABA)(from 125 mg Pharma GABA®) 100 mg **
L-theanine 50 mg **
Melatonin 2.5 mg **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Citric Acid Safe

Adds tartness and acts as a natural preservative. Also aids in ingredient stability.

Organic Tapioca Maltodextrin Generally_safe

It is used as a filler, binder, or carrier for other ingredients.

Natural Flavors Safe

Improves taste of chewable, gummy, or liquid supplements.

Stevia Leaf Extract Safe

Provides sweetness without calories or blood sugar impact.

Rice Hull Concentrate Safe

It is used to improve the flowability of powders during manufacturing.

Organic beetroot juice Unknown

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$23$22$21$20$19 Mar 12 $20.97
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Natural Factors

Founded 1950 · Coquitlam, British Columbia, Canada · 390 products · naturalfactors.com

Certifications

5 certifications
B Corp Certified Verified Source
Usp Verified Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

5 incidents
Prop 65 Lead2025-10-31Source
Recall Hi Potency B Complex, RevitalX, Super Multi® IRON FREE2024-07-19Source
Lawsuit Products labeled as containing glucosamine sulfate did not contain the ingredient.2021Source
Prop 65 Lead2016-01-13Source
Recall Natural Factors L-Arginine 500mg2006-04-05Source
Related Supplements
Frequently Asked Questions
Is Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin a good supplement?

Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin, Gaba & L-Theanine, Tropical Fruit, 4.23 oz (120 g) received a product quality score of 83/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 7 active ingredients with 30 servings per container. Of the 6 inactive ingredients, 4 are rated safe and 0 are flagged for review. The manufacturer, Natural Factors, holds a brand trust score of 88/100 with 5 verified certifications including B Corp Certified, Usp Verified, Fda Gmp Inspections, Non Gmo Project.

What are the ingredients in Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin?

Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin contains 7 active ingredients: Calories (10 g), Total carbohydrates (2 g), Protein (1 g), Magnesium (as bisglycinate) (200 mg), Gamma-aminobutyric acid (GABA)(from 125 mg Pharma GABA®) (100 mg), L-theanine (50 mg), and 1 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin safe to take?

Natural Factors Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin, Gaba & L-Theanine, Tropical Fruit, 4.23 oz (120 g) 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 Natural Factors a trustworthy supplement brand?

Natural Factors receives a brand trust score of 88/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1950 and headquartered in Coquitlam, British Columbia, Canada, the company offers 390 products in their lineup. They hold 5 verified certifications including B Corp Certified, Usp Verified, Fda Gmp Inspections, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Natural Factors 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. 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.