Leuphasyl
SkincareAlso known as: Pentapeptide-18, Tyr-D-Ala-Gly-Phe-Leu
Emerging ResearchWhat is Leuphasyl?
A synthetic enkephalin-analog pentapeptide that targets the opioid signaling pathway at the neuromuscular junction to modestly relax facial muscles. Designed to work synergistically with Argireline (Acetyl Hexapeptide-8), which targets a different step in the same muscle contraction pathway. Often combined with Argireline in professional anti-aging formulations.
How it works
Mimics enkephalin, binding to delta-opioid receptors at the neuromuscular junction to inhibit adenylate cyclase and reduce neurotransmitter release required for muscle contraction. Different mechanism from Argireline, which blocks the SNARE complex downstream. Combining the two targets sequential steps in muscle activation, theoretically producing a greater cumulative relaxation effect than either alone. Found in The Ordinary Buffet alongside Argireline.
What marketers claim
- ▸works as well as Botox
- ▸provides permanent wrinkle reduction
- ▸dramatically more effective than Argireline alone
What evidence supports
- ✓in vitro: Pentapeptide-18 reduces acetylcholine vesicle release from nerve terminals
- ✓small company-sponsored study: wrinkle depth reduction comparable to Argireline at 4% concentration
- ✓Lipotec combination study: Leuphasyl + Argireline showed ~24% wrinkle depth reduction vs ~11.5% for either alone (28 days)
Research evidence
Key studies on Leuphasyl, summarized in plain language. This is not an exhaustive list — it highlights the most relevant findings.
Pentapeptide-18 (Leuphasyl) reduces expression wrinkles in a controlled in vivo study
Finding: Lipotec-conducted study: 4% Leuphasyl reduced crow's feet wrinkle depth by approximately 11.5% after 28 days of twice-daily application; combination arm with Argireline produced approximately 24% wrinkle depth reduction — roughly double the effect of either peptide alone.
Limitation: Manufacturer-sponsored study with no independent replication; small sample size not disclosed in public summary; absence of a separate independent placebo-controlled arm limits interpretability.
Best for
What to expect
Realistic timeline based on available research. Individual results vary.
Week 1–2
No visible changes expected; peptide accumulates in skin with repeated application.
Week 4–8
Subtle softening of expression lines may become noticeable, particularly when combined with Argireline in a multi-peptide formulation.
Ongoing
Requires continuous use to maintain any benefit; effects reverse when product is discontinued, consistent with topical neurotransmitter-inhibiting peptides.
Safety notes & concerns
Full safety guide →- ⚠independent clinical trials extremely limited — most data from originating manufacturer (Lipotec)
- ⚠topical penetration to the neuromuscular junction is the same fundamental limitation as Argireline
- ⚠effective concentration in commercial products rarely disclosed
- ⚠"synergy" with Argireline is mechanistically plausible but not strongly demonstrated in blinded independent trials
Pairs well with
Use caution with
Frequently asked questions
How is Leuphasyl different from Argireline?
Argireline blocks the SNARE complex — the machinery that physically fuses neurotransmitter vesicles with the nerve terminal membrane during muscle contraction signaling. Leuphasyl works at an earlier step, mimicking enkephalin to inhibit neurotransmitter release before contraction signals even reach SNARE. Blocking both sequential steps is theoretically more effective than targeting either one alone, which is why the combination is common in professional multi-peptide formulations such as The Ordinary Buffet.
Products containing Leuphasyl
Related skincare peptides
fine lines, aging skin, anti-aging prevention
expression lines, forehead wrinkles, crow's feet
mature skin, anti-aging prevention, sensitive skin that cannot tolerate retinol
expression lines, forehead wrinkles, those seeking a step up from Argireline
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Last updated: 2026-06-10
Medical Disclaimer
The information on this site is for educational and informational purposes only. It is not intended as medical advice and should not be used to diagnose, treat, or prevent any condition. Always consult with a qualified healthcare professional before starting any new supplement, peptide, or treatment protocol.