Spermidine vs Tripeptide-29
Side-by-side comparison of key properties, dosing, and research.
Anti-Aging & LongevityCognitive Enhancement
SpermidineSkin & CosmeticAnti-Aging & Longevity
Tripeptide-29- Summary
- Spermidine is a naturally occurring polyamine found in all living cells, with exceptionally high concentrations in wheat germ, aged cheese, and human sperm. It is the most studied autophagy-inducing dietary compound, shown to extend lifespan across multiple species and reduce cardiovascular and cognitive aging.
- Tripeptide-29 is a pro-collagen cosmetic peptide composed of proline, hydroxyproline, and glycine — the core repeating unit of collagen. Applied topically, it signals dermal fibroblasts that collagen degradation has occurred, triggering compensatory new collagen synthesis.
- Half-Life
- ~30–60 minutes, but gut bacteria produce it continuously; supplementation raises tissue levels over weeks
- Not applicable (topical)
- Admin Route
- Oral
- Topical
- Research
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- Typical Dose
- 1–5 mg
- 0.01-0.1% in formulation
- Frequency
- Once daily
- Once or twice daily
- Key Benefits
- Induces autophagy — cellular self-cleaning
- Extends lifespan in yeast, flies, worms, and mice
- Reduces cardiovascular aging and arterial stiffness
- Reduces all-cause mortality (human epidemiological data)
- Neuroprotective: reduces amyloid and tau pathology
- Promotes hair growth (anagen phase activation)
- Reduces age-related immune decline
- Improves memory in aging models
- Stimulates fibroblast collagen synthesis via damage-signal mechanism
- Reduces fine lines and improves skin smoothness
- Supports dermal matrix integrity
- Naturally bioidentical to collagen fragment sequences
- Well-tolerated in all skin types
- Synergistic with copper peptides and retinoids
- Side Effects
- Generally very well tolerated
- Rare: mild GI discomfort at high doses
- May temporarily reduce some gut bacteria species
- Rare: headache at initiation
- Excellent tolerability profile
- No documented significant adverse effects at cosmetic concentrations
- Rare sensitivity reactions in individuals with peptide allergies
- Stacks With
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