You're getting 350mg of **Magnesium** per serving in bisglycinate form — one of the best-absorbed forms available, and one that's gentle on your stomach. That dose sits near the top of the 100–400mg clinical range, giving you strong support for muscle relaxation, energy production, and sleep quality. Since over half the population doesn't get enough magnesium from diet alone, this covers a meaningful gap.

The formula includes 5mg of **BioPerine** (black pepper extract) to boost absorption further — right at the studied minimum dose for enhancing nutrient uptake. Four capsules per serving is a moderate pill burden, but the tradeoff is a full clinical dose in a premium form.

The main thing to know: you need all four capsules to get the full 350mg. If you only take one or two, you're getting a fraction of the effective dose and losing the benefit of this product's strong formulation.

BioStacks
KAL

High Absorption Magnesium Glycinate 350

4 Capsules · 40 servings · $0.53/serving

iHerbAmazon

Best for

Sleep

Ingredients (2)

Magnesium

100%

Dose

350 mg

Target

100–400 mg

Form

Premium

BioPerine

100%

Dose

5 mg

Target

5–20 mg

Form

—

Nutrition

Calories, macros & sodium.

  • Calories10 Calorie(s)

Other Ingredients (3)

Magnesium StearateLubricant

A salt of stearic acid used as a lubricant in tablet and capsule production

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

How to Take It

Best taken in the evening

The Magnesium in it is what pulls this toward the evening. Black Pepper Extract is easier on the stomach taken with food.

With food
Space it a couple of hours from Iron and Calcium

On the label

Directions: Take 4 VegCaps daily with a meal or glass of water. Use only as directed.

General guidance based on the ingredients, not a substitute for the label or your doctor.

Price Check

$21.39

$10$20$50

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.

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