HBD-3 vs HD5
Head-to-head comparison of HBD-3 (Human Beta-Defensin 3) and HD5 (Human Alpha-Defensin 5) — benefits, dosing, side effects, research data, and where to buy.
| Property | HBD-3 | HD5 |
|---|---|---|
| Category | Immune Support | Immune Support |
| Full Name | Human Beta-Defensin 3 | Human Alpha-Defensin 5 |
| Molecular Weight | 5158 Da | 3708 Da |
| Half-Life | Minutes to hours; protease-sensitive | Minutes to hours; protease-sensitive |
| Amino Acids | 45 | 32 |
| Typical Dose | Research use only; no approved human dose | Research use only; no approved human dose |
| Route | Topical / Intranasal / Research parenteral | Oral-local gut / Research parenteral |
| Purity | ≥98% | ≥98% |
| Studies Count | 380 | 260 |
| Research Status | Pre-clinical | Pre-clinical |
HBD-3 Benefits
- ✓strong antimicrobial activity
- ✓skin and mucosal defense
- ✓innate immune signaling modulation
- ✓wound-healing support
HD5 Benefits
- ✓gut mucosal defense
- ✓antimicrobial activity
- ✓microbiome balance support
- ✓barrier integrity support
HBD-3 Dosing
0.1–10 µM in vitro|1–5 mg/kg in animal models|No established human dose
HD5 Dosing
0.1–10 µM in vitro|1–5 mg/kg in animal models|No established human dose
HBD-3 Side Effects
- ⚠cell toxicity at high concentrations
- ⚠rapid proteolysis
- ⚠inflammatory activation in some contexts
HD5 Side Effects
- ⚠protease sensitivity
- ⚠potential epithelial irritation at high concentrations
- ⚠unknown systemic safety
Research Overview
HBD-3
Human beta-defensin 3 has been examined in numerous in vitro and animal studies for antimicrobial and immunomodulatory activity. Research suggests it can help defend barrier tissues while influencing cytokine networks, chemotaxis, and epithelial repair.
HD5
HD5 has been widely studied in intestinal innate immunity, particularly for its role in defending crypts against bacterial invasion. Preclinical literature supports activity against multiple microbes and links altered HD5 biology with gut barrier dysfunction.
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