Life Extension Hair, Skin & Nails Collagen Plus Formula
vs
Douglas Laboratories Hair Growth+
Supplement Comparison

  • Zinc: same total amount on both labels
  • The image below shows:
    • Side-by-side charts with label nutrient amounts, per serving
    • Nutrient forms as listed on the label
    • 26 nutrients compared
Bar chart: per-serving label amounts and listed forms for Life Extension Hair, Skin & Nails Collagen Plus Formula vs Douglas Laboratories Hair Growth+.

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Frequently asked questions

Which active ingredients does Life Extension Hair, Skin & Nails Collagen Plus Formula have?

  • Vitamin B3 (Niacin) appears as Niacinamide
  • Vitamin B6 (Pyridoxine) appears as Pyridoxine HCl
  • Vitamin B7 (Biotin)
  • Vitamin B5 (Pantothenic Acid) appears as D-Calcium Pantothenate
  • Calcium appears as DiCalcium Phosphate
  • Zinc appears as Zinc Oxide
  • Copper appears as Copper Sulfate
  • Silicon appears as Bamboo Extract and Silicon Dioxide
  • Collagen Peptides appears as VERISOL Bioactive Collagen Peptides
  • Keratin appears as Cynatine HNS

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 categories do Life Extension Hair, Skin & Nails Collagen Plus Formula and Douglas Laboratories Hair Growth+ belong to?

  • Collagen
  • Herbal Extract

What health concerns do Life Extension Hair, Skin & Nails Collagen Plus Formula and Douglas Laboratories Hair Growth+ address?

  • Skin, Hair & Nail Health
  • Antioxidant Support

Which product has a higher amount of Zinc per serving?

  • Both products list the same total amount of Zinc per serving

How do the serving sizes compare between the two supplements?

  • Serving size:
    • Life Extension Hair, Skin & Nails Collagen Plus Formula: 4 tablets
    • Douglas Laboratories Hair Growth+: 2 capsules
  • Vitamin B3 (Niacin)
    • This supplement has 18 mg
    • Recommended Dietary Allowance in men: 16 mg
    • Recommended Dietary Allowance in women: 14 mg
    • Tolerable Upper Intake Level: 35 mg
  • Vitamin B6 (Pyridoxine)
    • This supplement has 2 mg
    • Recommended Dietary Allowance in men: 1.3 mg
    • Recommended Dietary Allowance in women: 1.3 mg
    • Tolerable Upper Intake Level: 100 mg
  • Vitamin B7 (Biotin)
    • This supplement has 2500 mcg
    • Adequate Intake in men: 30 mcg
    • Adequate Intake in women: 30 mcg
    • Tolerable Upper Intake Level: Not established
  • Vitamin B5 (Pantothenic Acid)
    • This supplement has 13.68 mg
    • Adequate Intake in men: 5 mg
    • Adequate Intake in women: 5 mg
    • Tolerable Upper Intake Level: Not established
  • Calcium
    • This supplement has 83 mg
    • Recommended Dietary Allowance in men: 1000 mg
    • Recommended Dietary Allowance in women: 1000 mg
    • Tolerable Upper Intake Level: 2500 mg
  • 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
  • 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 13, 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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  • Author: VIOscan Research Team