Metagenics Vitamin D3 10000 + K
vs
Douglas Laboratories Sereniten Plus
Supplement Comparison

  • Vitamin D: Metagenics Vitamin D3 10000 + K has 100× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 8 nutrients compared
Bar chart: per-serving label amounts and listed forms for Metagenics Vitamin D3 10000 + K vs Douglas Laboratories Sereniten Plus.

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Frequently asked questions

Which active ingredients does Metagenics Vitamin D3 10000 + K have?

  • Vitamin D appears as Cholecalciferol (D3)
  • Vitamin K appears as Vitamin K1 Phytonadione
  • Vitamin K appears as Vitamin K2 Menaquinone-7 (MK-7)

Which active ingredients does Douglas Laboratories Sereniten Plus have?

  • Vitamin D appears as Cholecalciferol (D3)
  • L-Theanine appears as Suntheanine L-Theanine
  • Casein appears as Lactium Casein Decapeptide (containing bioactive decapeptide)

Which categories do Metagenics Vitamin D3 10000 + K and Douglas Laboratories Sereniten Plus belong to?

  • Single Vitamin
  • Herbal Extract

What health concerns do Metagenics Vitamin D3 10000 + K and Douglas Laboratories Sereniten Plus address?

  • Brain, Focus & Cognitive Function
  • General Health
  • Heart & Cardiovascular Health
  • Immune System Support
  • Joint & Bone Health
  • Mood Support
  • Stress Management

Which product has a higher amount of Vitamin D per serving?

  • Metagenics Vitamin D3 10000 + K has the highest total amount of Vitamin D: 10000 IU per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Metagenics Vitamin D3 10000 + K: 1 softgel
    • Douglas Laboratories Sereniten Plus: 1 capsule
  • Vitamin D
    • This supplement has 10000 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU
  • Vitamin K
    • This supplement has 110 mcg
    • Adequate Intake in men: 120 mcg
    • Adequate Intake in women: 90 mcg
    • Tolerable Upper Intake Level: Not established
  • Vitamin D
    • This supplement has 100 IU
    • Recommended Dietary Allowance in men: 600 IU
    • Recommended Dietary Allowance in women: 600 IU
    • Tolerable Upper Intake Level: 4000 IU

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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  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team