Douglas Laboratories Hair Growth+
vs
Metagenics Berberine GT
Supplement Comparison

  • Green Tea: Douglas Laboratories Hair Growth+ has 88% more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 11 nutrients compared
Bar chart: per-serving label amounts and listed forms for Douglas Laboratories Hair Growth+ vs Metagenics Berberine GT.

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Frequently asked questions

Which active ingredients does Douglas Laboratories Hair Growth+ have?

  • Zinc appears as Zinc Gluconate
  • Green Tea appears as Green Tea Extract (Camellia sinensis leaf, standardized to 98% polyphenols and 45% EGCG)
  • Grape (Vitis vinifera) Seed Extract appears as Grape Seed Extract (Vitis vinifera, 90% polyphenols)
  • Taurine
  • Pea Shoot Extract appears as AnaGain Nu (pea shoot extract, Pisum sativum)

Which active ingredients does Metagenics Berberine GT have?

  • Green Tea appears as Decaffeinated Green Tea Extract (Camellia sinensis leaf, standardized to 60% catechins and 40% EGCG)
  • Berberine appears as Berberine HCl

Which categories do Douglas Laboratories Hair Growth+ and Metagenics Berberine GT belong to?

  • Herbal Extract
  • Metabolic Support Formula

What health concerns do Douglas Laboratories Hair Growth+ and Metagenics Berberine GT address?

  • Antioxidant Support
  • Skin, Hair & Nail Health
  • Blood Sugar Support
  • Heart & Cardiovascular Health
  • Weight Management

Which product has a higher amount of Green Tea per serving?

  • Douglas Laboratories Hair Growth+ has the highest total amount of Green Tea: 375 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Douglas Laboratories Hair Growth+: 2 capsules
    • Metagenics Berberine GT: 1 capsule
  • Zinc
    • This supplement has 15 mg
    • Recommended Dietary Allowance in men: 11 mg
    • Recommended Dietary Allowance in women: 8 mg
    • Tolerable Upper Intake Level: 40 mg

Last updated: February 21, 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