Metagenics Magnesium L-Threonate
vs
Douglas Laboratories Hair, Skin and Nails Plus
Supplement Comparison

  • Magnesium: Metagenics Magnesium L-Threonate has 78% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 20 nutrients compared
Bar chart: per-serving label amounts and listed forms for Metagenics Magnesium L-Threonate vs Douglas Laboratories Hair, Skin and Nails Plus.

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Frequently asked questions

Which active ingredients does Metagenics Magnesium L-Threonate have?

  • Magnesium appears as Magtein Magnesium L-Threonate

Which active ingredients does Douglas Laboratories Hair, Skin and Nails Plus have?

  • Vitamin A appears as Retinyl Palmitate
  • Vitamin C appears as Vitamin C Complex (calcium ascorbate, magnesium ascorbate, manganese ascorbate, ascorbic acid)
  • PABA
  • Calcium appears as Calcium Complex (calcium malate, citrate, ascorbate)
  • Iron appears as Ferronyl Iron
  • Magnesium appears as Magnesium Malate
  • Zinc appears as Zinc Krebs Complex (citrate, fumarate, malate, glutarate, succinate, ascorbate)
  • Manganese appears as Manganese Citrate and Ascorbate
  • Citrus Bioflavonoid Complex
  • Horsetail (Equisetum arvense) Extract
  • Sunflower Lecithin appears as Lecithin (from soy, high in phosphatidylcholine)
  • Gelatin

Which categories do Metagenics Magnesium L-Threonate and Douglas Laboratories Hair, Skin and Nails Plus belong to?

  • Single Mineral
  • Multivitamin

What health concerns do Metagenics Magnesium L-Threonate and Douglas Laboratories Hair, Skin and Nails Plus address?

  • Muscle Support
  • Brain, Focus & Cognitive Function
  • Sleep Quality
  • Stress Management
  • General Health
  • Skin, Hair & Nail Health

Which product has a higher amount of Magnesium per serving?

  • Metagenics Magnesium L-Threonate has the highest total amount of Magnesium: 98 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Metagenics Magnesium L-Threonate: 2 capsules
    • Douglas Laboratories Hair, Skin and Nails Plus: 2 capsules
  • Vitamin A
    • This supplement has 2250 mcg RAE
    • Recommended Dietary Allowance in men: 900 mcg RAE
    • Recommended Dietary Allowance in women: 700 mcg RAE
    • Tolerable Upper Intake Level: 3000 mcg RAE
  • Vitamin C
    • This supplement has 62.5 mg
    • Recommended Dietary Allowance in men: 90 mg
    • Recommended Dietary Allowance in women: 75 mg
    • Tolerable Upper Intake Level: 2000 mg
  • Calcium
    • This supplement has 80 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Iron
    • This supplement has 7.5 mg
    • Recommended Dietary Allowance in men: 8 mg
    • Recommended Dietary Allowance in women: 18 mg
    • Tolerable Upper Intake Level: 45 mg
  • Zinc
    • This supplement has 7.5 mg
    • Recommended Dietary Allowance in men: 11 mg
    • Recommended Dietary Allowance in women: 8 mg
    • Tolerable Upper Intake Level: 40 mg
  • Manganese
    • This supplement has 5 mg
    • Adequate Intake in men: 2.3 mg
    • Adequate Intake in women: 1.8 mg
    • Tolerable Upper Intake Level: 11 mg

Last updated: February 4, 2026

  • Sources & Methodology: Nutrient data and forms are taken directly from Supplement Facts labels. Reviewed and standardized by the VIOscan Research Team. Learn more on the Methodology page.
  • We show the Recommended Dietary Allowance (RDA) when available. If no RDA exists, we show the Adequate Intake (AI). Tolerable Upper Intake Levels (UL) are used for upper limits. Unless otherwise noted, RDAs shown correspond to healthy adults aged 19–50 years and are sex-specific. Separate values exist for 51–70 years and >70 years, and pregnancy and lactation are excluded. All values come from the Dietary Reference Intakes (DRIs) published by the National Academies of Sciences, Engineering, and Medicine (NASEM), Food and Nutrition Board (FNB).
  • Transparency: We’re funded by our users. We don’t have sponsors or affiliate links, and we don’t sell supplements.
  • Editorial standards: we provide independent, impartial and objective data analysis.
  • This analysis is for educational purposes only. It is not a substitute for medical advice.
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  • Author: VIOscan Research Team