BioStacks
Natural Factors
Stress-Relax®, Nighttime Magnesium Bisglycinate Powder with Melatonin, Gaba & L-Theanine, Tropical Fruit, 4.23 oz (120 g)
Powder · 1 Scoop (4 g)
Best for
Ingredients (4)
Melatonin
100%Dose
2.5 mg
Target
0.5–5 mg
Form
—
Magnesium
100%Dose
200 mg
Target
100–400 mg
Form
Premium
Gamma-aminobutyric acid
100%Dose
100 mg
Target
100–300 mg
Form
—
L-theanine
50%Dose
50 mg
Target
100–250 mg
Form
—
Other Ingredients (6)
MaltodextrinBinder
Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.
Natural FlavorsFlavor
Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.
Rice HullsAnti-caking
Ground outer husk of rice grains used as a plant-based flow and anti-caking agent
Citric AcidAcidulant
Natural acid derived from citrus fruits
Beetroot Juice PowderColorant
Natural red colorant and mild flavoring derived from beetroot; often spray-dried onto maltodextrin carrier
Stevia ExtractSweetener
Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana
How to Take It
Best taken in the evening
Take 30–60 minutes before bed. It's a circadian signal, not a daytime supplement.
With or without food
Space it a couple of hours from Iron and Calcium
On the label
All uses except jet lag: Take 1 scoop dissolved in water once a day, at or before bedtime, or use as directed by a health care professional.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$20.97
Near the median of 614 magnesium supplements
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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.