Side-by-Side Comparison · 2026

Gramicidin A vs Theta-Defensin

Gramicidin A vs Theta-Defensin — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Gramicidin A
Antimicrobial Peptide

Gramicidin A is a 15-residue linear peptide antibiotic from Bacillus brevis, distinct from the cyclic gramicidin S despite sharing the same producer organism. Gramicidin A is the active component in Neosporin and other topical antibiotic combinations....

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Theta-Defensin
Antimicrobial Peptide

Theta-defensins are the only known cyclic peptides produced in the animal kingdom. Found in rhesus macaques and other Old World primates, they are formed by ligation of two 9-residue alpha-defensin gene products into an 18-residue macrocyclic structure....

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Key Parameters
Parameter Gramicidin A Theta-Defensin
Category Antimicrobial Peptide Antimicrobial Peptide
Research Approved (topical combination) Preclinical
Half-Life Hours (membrane-bound) Extended (cyclic stability)
Typical Dose Component of Neosporin and similar products N/A (research only)
Frequency As needed N/A
Route Topical (combination products) Systemic (research)
FDA Status Approved (topical combination) Not approved

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Frequently Asked Questions
What is the difference between Gramicidin A and Theta-Defensin?
Gramicidin A: Gramicidin A is a 15-residue linear peptide antibiotic from Bacillus brevis, distinct from the cyclic gramicidin S despite sharing the same producer organism. Gramicidin A is the active component in N... Theta-Defensin: Theta-defensins are the only known cyclic peptides produced in the animal kingdom. Found in rhesus macaques and other Old World primates, they are formed by ligation of two 9-residue alpha-defensin ge...
Which has a longer half-life, Gramicidin A or Theta-Defensin?
Gramicidin A half-life: Hours (membrane-bound). Theta-Defensin half-life: Extended (cyclic stability).
Can you stack Gramicidin A and Theta-Defensin?
Gramicidin A and Theta-Defensin 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.