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Magnesium L-threonate FAQ: ingredients, side effects, dosage, and safety

Use this FAQ to answer the main product questions quickly, then open the focused pages for deeper safety, dosage, or ingredient context.

Limited evidence Medium safety attention Experience: Early

Quick answer

Magtein Magnesium L-Threonate is a Magnesium product from NOW Foods. The most useful checks are ingredients, dose, allergen or medication cautions, price per serving, and whether it fits your goal.

What to check next

Ingredients: Magnesium L-threonate · Goal fit: Brain Health, Stress · Estimated price: $0.85 per serving estimate at last check; retailer prices can change.

Label Check

Last checked
2026-08-04
Next check
2026-08-22
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What to compare

Use this FAQ to answer the main product questions quickly, then open the focused pages for deeper safety, dosage, or ingredient context.

Product Context

Magtein Magnesium L-Threonate is a Magnesium product from NOW Foods. Label context includes Capsule, serving size 3 capsules, Price context: $0.85 per serving estimate at last check; retailer prices can change.

Safety and Uncertainty

  • Higher cost and limited evidence compared with common forms.
  • Medication: Magnesium may need to be separated from certain antibiotics, thyroid medication, or bisphosphonates if advised.
  • Condition: Kidney disease or impaired kidney function requires professional guidance before magnesium use.
  • Possible side effect: Loose stools, cramping, or digestive discomfort may occur, especially with citrate or higher doses.
  • Dose: Avoid stacking multiple magnesium products without checking total elemental magnesium intake.
  • Pregnancy/Breastfeeding: Ask a healthcare professional before using supplemental magnesium during pregnancy or breastfeeding.
  • Ingredient context: Often marketed for cognitive support; evidence and cost should be compared carefully.

Results and fit can vary. Check the label and safety notes before choosing.

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