You're getting 300mg of **Magnesium** per scoop — solidly within the 100–400mg clinical range studied for muscle relaxation, stress support, and sleep quality. The citrate form absorbs well and dissolves in water, which makes it easier to take than swallowing multiple capsules. One serving a day puts you at 75% of the top of the studied range, so you're covered without needing to split doses.

The drink mix format has a practical upside: you absorb the full dose at once in solution rather than waiting for a tablet to break down. Citrate does have a mild laxative effect at higher doses, which can actually be a benefit if regularity is a goal — but worth knowing if you're sensitive.

At 300mg you're still 50mg below the tolerable upper limit for supplemental magnesium (350mg), so there's a small margin to increase if needed. If you're specifically targeting sleep or calm, a glycinate or threonate form would be more targeted for those goals since citrate's main advantage is general absorption and GI motility.

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Natural Factors Stress-Relax

Magnesium Citrate Berry Drink Mix

Powder · 3.3 Gram · 75 servings · $0.28/serving

iHerbAmazon

Best for

Heart

Ingredients (2)

Magnesium

100%

Dose

300 mg

Target

100–400 mg

Form

Standard

Stevia leaf powder

10 mg

Not in our database

Other Ingredients (1)

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.

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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.

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