HD5 vs HBD-3
Head-to-head comparison of HD5 (Human Alpha-Defensin 5) and HBD-3 (Human Beta-Defensin 3) — benefits, dosing, side effects, research data, and where to buy.
| Property | HD5 | HBD-3 |
|---|---|---|
| Category | Immune Support | Immune Support |
| Full Name | Human Alpha-Defensin 5 | Human Beta-Defensin 3 |
| Molecular Weight | 3708 Da | 5158 Da |
| Half-Life | Minutes to hours; protease-sensitive | Minutes to hours; protease-sensitive |
| Amino Acids | 32 | 45 |
| Typical Dose | Research use only; no approved human dose | Research use only; no approved human dose |
| Route | Oral-local gut / Research parenteral | Topical / Intranasal / Research parenteral |
| Purity | ≥98% | ≥98% |
| Studies Count | 260 | 380 |
| Research Status | Pre-clinical | Pre-clinical |
HD5 Benefits
- ✓gut mucosal defense
- ✓antimicrobial activity
- ✓microbiome balance support
- ✓barrier integrity support
HBD-3 Benefits
- ✓strong antimicrobial activity
- ✓skin and mucosal defense
- ✓innate immune signaling modulation
- ✓wound-healing support
HD5 Dosing
0.1–10 µM in vitro|1–5 mg/kg in animal models|No established human dose
HBD-3 Dosing
0.1–10 µM in vitro|1–5 mg/kg in animal models|No established human dose
HD5 Side Effects
- ⚠protease sensitivity
- ⚠potential epithelial irritation at high concentrations
- ⚠unknown systemic safety
HBD-3 Side Effects
- ⚠cell toxicity at high concentrations
- ⚠rapid proteolysis
- ⚠inflammatory activation in some contexts
Research Overview
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.
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.
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