Take both capsules daily and you're getting 300mg of elemental **magnesium** — squarely within the 100–400mg supplemental range studied for sleep, muscle relaxation, and steady heart rhythm. The label's 833mg figure is the magnesium bisglycinate compound weight; the elemental magnesium your body counts is 150mg per capsule, so the twice-daily direction is what reaches a full dose.
Bisglycinate is the reason to reach for this one — magnesium bound to the amino acid glycine absorbs well and stays gentle on the gut, sidestepping the loose-stool effect magnesium can otherwise cause. That makes it easy to take every day, which matters more than chasing a bigger number.
The thing to watch is the per-capsule math. One capsule gives you 150mg, a reasonable top-up, but reaching the studied range for calm and muscle support means following the label's two-a-day.
BioStacks
Other Ingredients (4)
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Purified WaterSolvent
Water meeting USP specifications used as solvent/vehicle in gummies and liquids
HypromelloseCapsule
Plant-derived capsule material from cellulose
How to Take It
Best taken in the evening
Magnesium bisglycinate is the gentlest form on the gut and the one most people take at night. Absorption doesn't change with the clock — consistency does.
With or without food
Space it a couple of hours from Iron and Calcium
Label directs 2 servings — keep one for the evening
On the label
Adults Take 1 capsule twice daily or as directed by your healthcare practitioner.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$24.74
Near the median of 579 magnesium supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the 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. studied 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.