You're getting 420mg of **Magnesium** per tablespoon — right at the top of the clinical supplemental range (100–400mg) used in research on muscle function, energy production, and sleep quality. The liquid format means faster absorption than tablets or capsules, and the citrate form absorbs well, making this a solid option if you're looking to correct low magnesium levels or support relaxation.

Magnesium deficiency is extremely common — estimated to affect over half the population — and your body uses it in hundreds of processes, from keeping your heart rhythm steady to supporting bone density and nervous system function. At this dose, you're fully covered for general supplementation across those areas.

One thing to note: 420mg exceeds the tolerable upper limit of 350mg for supplemental magnesium, and citrate has a mild laxative effect at higher doses. If you experience GI discomfort, splitting the serving into two half-tablespoons throughout the day is worth trying.

BioStacks
Bluebonnet

Liquid Magnesium Citrate Mixed Berry Flavor

Liquid · 15 mL · 32 servings · $0.54/serving

iHerbAmazon

Best for

Heart

Ingredients (1)

Magnesium

100%

Dose

420 mg

Target

100–400 mg

Form

Standard

Nutrition

Calories, macros & sodium.

  • Calories10 Calorie(s)
  • Total Carbohydrates4 Gram(s)
    • Total Sugars1 Gram(s)

Other Ingredients (8)

CarrageenanThickener

Can break down into poligeenan (a known inflammatory) under stomach acid conditions. Tobacman (2001, Environmental Health Perspectives) reviewed evidence linking carrageenan to intestinal inflammation and ulceration. Major food brands (Silk, Stonyfield) have voluntarily removed it. Used only as a thickener — provides no health benefit.

FructoseSweetener

Added free fructose is metabolized in the liver and at habitual intake is linked to elevated triglycerides, hepatic fat accumulation, and insulin resistance; an avoidable sugar load with no supplement benefit.

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.

Potassium SorbatePreservative

Natural preservative derived from sorbic acid

Citric AcidAcidulant

Natural acid derived from citrus fruits

Stevia ExtractSweetener

Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana

Purified WaterSolvent

Water meeting USP specifications used as solvent/vehicle in gummies and liquids

Xanthan GumThickener

Natural thickener from fermented carbohydrates

How to Take It

Best taken in the evening

Magnesium citrate pulls water into the bowel — mildly laxative at higher doses. Evening suits that; split the dose or switch to glycinate if it's too much.

With or without food
Space it a couple of hours from Iron and Calcium

On the label

Directions: As a dietary supplement, take one tablespoon (15 mL) daily or as directed by a healthcare practitioner. Shake well before serving.

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

Price Check

$17.20

$10$20$50

Cheaper than 65% of 579 magnesium supplements

Track this supplement in your stack

Get personalized insights, interactions, and coverage recommendations.

Get Started Free

Similar Supplements

Magnesium Glycinate 400 mg

Bluebonnet

Magnesium Glycinate 400 mg

😴 for Sleep

100
Cognitive Health

Cooper Complete

Cognitive Health

😴 for Sleep

100
Magnesium Glycinate 500 mg

DC

Magnesium Glycinate 500 mg

❤️ for Heart

100
NeuroMag™

Designs for Health

NeuroMag™

😴 for Sleep

100
Magnesium Taurate 1500 mg

Double Wood Supplements

Magnesium Taurate 1500 mg

❤️ for Heart

100

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.

BioStacks

Know exactly what's in your supplements.

Navigate

  • Home
  • Manifesto
  • App Store
  • Google Play

Resources

  • Contact & Support
  • Pricing
  • Terms of Service
  • Privacy Policy
  • Refund Policy

Explore

  • Health Areas
  • Best Supplements
  • Nutrients
  • All Supplements

Popular Picks

  • Best Magnesium for Sleep
  • Best Collagen for Skin
  • Best Creatine for Muscle
  • Best Vitamin D for Bone Health
  • Best Probiotics for Digestion
  • Best CoQ10 for Heart

Free Tools

  • Interaction Checker
  • Dose Checker
  • Form Comparison

Field Guides

  • Magnesium for sleep
  • Reading labels
  • Interaction checker
  • Dose checker
  • Harmful ingredients
  • Proprietary blends
  • Stack building
  • Scan without barcode
  • All guides →
© 2026 BioStacks. All rights reserved. Not medical advice.