Build lean muscle
Studied in pathways tied to body composition and recovery signaling.
Unlock your potential
4LD Peptides
Peptidesfor a better you
Advanced peptides. Real results. Premium, USA-made, third-party tested research materials — with 18% off through Dave Sweet.
Research use only · Not for human consumption
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Premium quality
Research grade
Purity tested
Cellular communication
Peptides are the language of the cell
Over time, the body’s natural signals can become quiet, interrupted, damaged, or misdirected. Peptides are short amino acid chains studied for their role in cellular signaling, repair pathways, metabolic function, recovery, and longevity-focused research.
At 4LD we provide premium research peptides designed to support the study of how the cellular network communicates, responds, and restores balance at the molecular level.
From recovery pathways to metabolic health, tissue support, mitochondrial function, and longevity research, peptides are opening a deeper understanding of how the body’s systems are designed to communicate and repair.
Advanced peptides. Real results.
Unlock your potential
What researchers explore
Burn fat & boost metabolism
Metabolic peptides investigated for energy expenditure and adipose biology.
Increase energy
Mitochondrial compounds researched for cellular energetics and redox balance.
Enhance recovery
Tissue-support peptides explored in repair, mobility, and remodeling models.
Support brain & longevity
Cognitive and aging-pathway research spanning focus, resilience, and healthspan.
Optimize at the cellular level
Short amino-acid chains used to study how cells communicate and restore balance.
The catalog
Featured research peptides
Flagship 4LD vials — including Retatrutide, SS-31, MOTS-C, TB-500, BPC-157, KPV, and NAD+ — plus stacks. Use code DS18 for 18% off.
4LDPeptidesRetatrutide10 mgResearch use only
Retatrutide
Featured10 mg · Triple-agonist metabolic research
A synthetic multi-receptor peptide investigated for concurrent GLP-1, GIP, and glucagon pathway activity. Frequently referenced in body-composition, energy-expenditure, and metabolic-signaling studies.
From $85
18% off with DS18
4LDPeptidesSS-3110 mgResearch use only
SS-31
Featured10 mg · Mitochondria-targeted tetrapeptide
Also known as elamipretide. A mitochondria-targeted tetrapeptide studied for cardiolipin interactions, electron-transport efficiency, and oxidative-stress models in cellular energy research.
From $91
18% off with DS18
4LDPeptidesMOTS-C10 mgResearch use only
MOTS-C
Featured10 mg · Mitochondrial-encoded peptide
A mitochondrial open-reading-frame peptide studied for AMPK signaling, metabolic homeostasis, exercise-capacity models, and healthy-aging research.
From $85
18% off with DS18
4LDPeptidesTB-50010 mgResearch use only
TB-500
Featured10 mg · Actin-regulation & tissue research
A synthetic fragment of thymosin beta-4 investigated for actin-binding, cell migration, and tissue-remodeling pathways in recovery-biology research.
From $91
18% off with DS18
4LDPeptidesBPC-15710 mgResearch use only
BPC-157
Featured10 mg · Gastric pentadecapeptide
A synthetic pentadecapeptide derived from a protective gastric protein sequence. Studied in angiogenesis, nitric-oxide signaling, gastrointestinal physiology, and connective-tissue research.
From $49
18% off with DS18
4LDPeptidesKPV10 mgResearch use only
KPV
Featured10 mg · α-MSH tripeptide fragment
The C-terminal tripeptide of alpha-MSH, investigated for anti-inflammatory signaling, epithelial-barrier integrity, and immune-modulation research.
From $85
18% off with DS18
4LDPeptidesNAD+1000 mgResearch use only
NAD+
Featured1000 mg · Cellular redox coenzyme
Nicotinamide adenine dinucleotide, a coenzyme studied for redox metabolism, sirtuin activity, mitochondrial function, recovery, and longevity-focused research.
From $49
18% off with DS18
4LDPeptidesWolverine BlendResearch kitResearch use only
Wolverine Blend
FeaturedResearch kit · BPC-157 + TB-500
A paired research formulation of BPC-157 and TB-500, commonly explored together in recovery, mobility, tissue-support, and physical-resilience laboratory models.
From $79
18% off with DS18
From synthesis to shipment
Quality that holds up in the lab
Premium quality
Top-tier peptides you can trust — identity-verified, induction-sealed.
Research grade
Produced exclusively for laboratory and in-vitro research applications.
Third-party tested
Every batch checked for purity, identity, and concentration.
Fast & discreet shipping
Secure packaging. Typical U.S. delivery in 3–5 business days.
Manufactured and tested in the United States.
Your 4LD affiliate
Work with Dave Sweet
Dave helps people pursue greater clarity, strength, and longevity through education, responsible wellness practices, and informed decision-making. He serves adults of all ages — with a special passion for helping seniors — across Washington and Southern California.
His interest in health began in the 1970s working in his family’s nutrition store. After facing his own challenges with blood pressure, blood sugar, cholesterol, and medication side effects, a trusted friend pointed him toward peptide research. Watching his wife regain vibrancy after years of severe inflammation made the mission personal.
Education-first. Always in collaboration with qualified clinicians.
Questions
Research, ordering, shipping
Straight answers. If you need a walkthrough, call Dave — he is the independent 4LD affiliate behind this storefront.
Use discount code DS18
Explore premium peptides today
Research use only — to bring better health to our lives through clearer science, better materials, and informed decisions.