Douglas Laboratories TestoGain
vs
Metagenics Kaprex
Supplement Comparison

  • Blend: Douglas Laboratories TestoGain has 3.7× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 2 nutrients compared
Bar chart: per-serving label amounts and listed forms for Douglas Laboratories TestoGain vs Metagenics Kaprex.

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Frequently asked questions

Which active ingredients does Douglas Laboratories TestoGain have?

  • Blend appears as Phytocrine Proprietary Blend (Horny Goat Weed Extract Velvet Bean Extract Gokhru Extract Maca Damiana Muira Puama Eleutherococcus senticosus Root Extract Tongkat Ali Extract Panax ginseng Root Extract Ashwagandha Extract)

Which active ingredients does Metagenics Kaprex have?

  • Blend appears as Proprietary Blend Tetrase Rosemary Leaf Extract Oleanolic Acid from Olive Leaf Extract

Which categories do Douglas Laboratories TestoGain and Metagenics Kaprex belong to?

  • Herbal Extract
  • Hormone Support Formula
  • Joint Formula

What health concerns do Douglas Laboratories TestoGain and Metagenics Kaprex address?

  • Sexual Health
  • Hormonal Balance
  • Men's Health
  • Anti-Inflammatory Support
  • Joint & Bone Health

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Douglas Laboratories TestoGain: 2 capsules
    • Metagenics Kaprex: 1 softgel

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