This nighttime formula pairs **Magnesium** at 200mg with **Melatonin** at 2.5mg — both comfortably within their clinical ranges for sleep support. The magnesium comes as a glycinate-oxide blend, so you're getting a mix of well-absorbed and poorly-absorbed forms rather than pure glycinate. At 200mg elemental, it's enough to contribute meaningfully to relaxation and muscle function, especially if your diet already covers part of your daily need.

**GABA** is sourced from PharmaGABA, a fermented form that may absorb better than synthetic versions. At 100mg you're at the floor of the studied range — enough to potentially take the edge off, though the evidence for oral GABA crossing the blood-brain barrier is still debated. **Melatonin** at 2.5mg is a moderate dose that should help with sleep onset without the grogginess that higher doses can cause.

The weakest link is **L-Theanine** at just 50mg — half the minimum clinical dose of 100mg used in relaxation studies. If calming support from theanine is important to you, you'd need to supplement it separately to reach the 100–200mg range where the research shows benefit.

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BioStacks

Natural Factors

Stress-Relax Nighttime Magnesium Glycinate With Melatonin, GABA & L-Theanine

Capsule · 30 servings · $0.65/serving

72 / 100Good

Score Breakdown

Formulation
72
Safety
100
Final score
72/100

Ingredients (4)

Melatonin2.5 mg

Optimal dose

Magnesium200 mg

Optimal dose · Premium form

Gamma-aminobutyric acid (GABA)100 mg

Within effective range · Premium form

L-Theanine50 mg

50% of effective dose

Label Nutrition Facts

Active Ingredients

From the label · % Daily Value

DV%

Magnesium200 mg

100%

Gamma-aminobutyric acid (GABA)100 mg

L-Theanine50 mg

Melatonin2.5 mg

Other Ingredients

Fillers, coatings, and additives

4Safe

Magnesium StearateLubricant

Safe

Silicon DioxideAnti-caking

Safe

Rice FlourFiller

Safe

Stearic AcidLubricant

Safe

vegetarian capsule (hypromellose, purified water)

Unknown

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.