Doctor's Best Natural Brain Enhancers
vs
SIXSTAR Testosterone Booster
Supplement Comparison

  • Calcium: Doctor's Best Natural Brain Enhancers has 3.5× more
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 12 nutrients compared
Bar chart: per-serving label amounts and listed forms for Doctor's Best Natural Brain Enhancers vs SIXSTAR Testosterone Booster.

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Frequently asked questions

Which active ingredients does Doctor's Best Natural Brain Enhancers have?

  • Calcium appears as DiCalcium Phosphate
  • Phosphatidylserine appears as SerinAid PhosphatidylSerine (PS)
  • Alpha GPC appears as AlphaSize GlyceroPhosphoCholine (GPC)

Which active ingredients does SIXSTAR Testosterone Booster have?

  • Calcium
  • Sodium
  • Boron appears as Boron citrate
  • Ginkgo Biloba appears as Ginkgo Extract (Ginkgo biloba) (leaf)
  • Rhodiola Extract

Which categories do Doctor's Best Natural Brain Enhancers and SIXSTAR Testosterone Booster belong to?

  • Single Vitamin
  • Hormone Support Formula
  • Sports Formula

What health concerns do Doctor's Best Natural Brain Enhancers and SIXSTAR Testosterone Booster address?

  • Brain, Focus & Cognitive Function
  • Stress Management
  • Athletic Performance
  • Sexual Health
  • Hormonal Balance
  • Men's Health

Which product has a higher amount of Calcium per serving?

  • Doctor's Best Natural Brain Enhancers has the highest total amount of Calcium: 175 mg per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Doctor's Best Natural Brain Enhancers: 2 capsules
    • SIXSTAR Testosterone Booster: 2 tablets
  • Calcium
    • This supplement has 175 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Calcium
    • This supplement has 50 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • Sodium
    • This supplement has 10 mg
    • Adequate Intake in men: 1500 mg
    • Adequate Intake in women: 1500 mg
    • Tolerable Upper Intake Level: Not established

Last updated: February 3, 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