Douglas Laboratories Sereniten Plus
vs
Metagenics SeroSyn
Supplement Comparison

  • L-Theanine: Metagenics SeroSyn has 60% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 17 nutrients compared
Bar chart: per-serving label amounts and listed forms for Douglas Laboratories Sereniten Plus vs Metagenics SeroSyn.

Try the VIOscan dashboard demo for free

Build comparison charts in seconds – no signup or card needed

This is a free preview of the $9.99/month premium dashboard

Use the interactive demo with multivitamins samples

Try Free Demo

Frequently asked questions

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 active ingredients does Metagenics SeroSyn have?

  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl
  • Vitamin B9 (Folate) appears as Calcium-L-5-methyltetrahydrofolate
  • Vitamin B12 (Cobalamin) appears as Methylcobalamin
  • 5-Hydroxytryptophan
  • Asian Ginseng Extract appears as Asian Ginseng (Panax ginseng) Root Extract standardized to 8% ginsenosides
  • L-Theanine
  • Chinese Skullcap (Scutellaria baicalensis) appears as Chinese Skullcap (Scutellaria baicalensis) Root Extract standardized to 30% flavones

Which categories do Douglas Laboratories Sereniten Plus and Metagenics SeroSyn belong to?

  • Herbal Extract
  • Single Mineral

What health concerns do Douglas Laboratories Sereniten Plus and Metagenics SeroSyn address?

  • Mood Support
  • Stress Management

Which product has a higher amount of L-Theanine per serving?

  • Metagenics SeroSyn has the highest total amount of L-Theanine: 80 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Douglas Laboratories Sereniten Plus: 1 capsule
    • Metagenics SeroSyn: 1 capsule
  • 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
  • Vitamin B6 (Pyridoxine)
    • This supplement has 10 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.3 mg
    • Tolerable Upper Intake Level: 100 mg
  • Vitamin B9 (Folate)
    • This supplement has 555 mcg DFE
    • Recommended Dietary Allowance in men: 400 mcg DFE
    • Recommended Dietary Allowance in women: 400 mcg DFE
    • Tolerable Upper Intake Level: 1000 mcg DFE
  • Vitamin B12 (Cobalamin)
    • This supplement has 250 mcg
    • Recommended Dietary Allowance in men: 2.4 mcg
    • Recommended Dietary Allowance in women: 2.4 mcg
    • Tolerable Upper Intake Level: Not established

Last updated: February 9, 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.
  • Questions? Read our Frequently Asked Questions or contact us, we’re here to help.
  • See an error? Report it through our Contact page.
  • Author: VIOscan Research Team