Side-by-Side Comparison · 2026

Beta-Defensin-1 vs Polymyxin B

Beta-Defensin-1 vs Polymyxin B — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Beta-Defensin-1
Antimicrobial Peptide

Human beta-defensin-1 (HBD-1) is a constitutively expressed antimicrobial peptide produced by epithelial cells of the skin, respiratory tract, and genitourinary system. Unlike inducible defensins, HBD-1 is present at steady-state levels as a component of basal innate immune defen...

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Polymyxin B
Antimicrobial Peptide

Polymyxin B is a cyclic lipopeptide antibiotic from Bacillus polymyxa that was approved in the 1960s and fell out of favor due to nephrotoxicity, but has experienced a major clinical resurgence as a last-resort treatment for carbapenem-resistant Gram-negative infections (Acinetob...

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Key Parameters
Parameter Beta-Defensin-1 Polymyxin B
Category Antimicrobial Peptide Antimicrobial Peptide
Research Preclinical FDA Approved
Half-Life Hours 6-8 hours
Typical Dose N/A (endogenous) 15,000-25,000 units/kg/day IV
Frequency Constitutive Every 12 hours IV
Route Endogenous IV / IM / Topical / Intrathecal
FDA Status Not approved Approved (systemic Gram-negative infections)

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Frequently Asked Questions
What is the difference between Beta-Defensin-1 and Polymyxin B?
Beta-Defensin-1: Human beta-defensin-1 (HBD-1) is a constitutively expressed antimicrobial peptide produced by epithelial cells of the skin, respiratory tract, and genitourinary system. Unlike inducible defensins, HBD... Polymyxin B: Polymyxin B is a cyclic lipopeptide antibiotic from Bacillus polymyxa that was approved in the 1960s and fell out of favor due to nephrotoxicity, but has experienced a major clinical resurgence as a l...
Which has a longer half-life, Beta-Defensin-1 or Polymyxin B?
Beta-Defensin-1 half-life: Hours. Polymyxin B half-life: 6-8 hours.
Can you stack Beta-Defensin-1 and Polymyxin B?
Beta-Defensin-1 and Polymyxin B are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.