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DSIP · 5mg
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$227.66
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$188.95
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5 vials
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99%+ HPLC Purity — Independently verified by accredited US laboratory -
Endotoxin-Screened — LAL tested, LPS-free, endotoxin report available
-
GMP-Certified Manufacturing — USA facility, ISO 9001:2015
-
Lyophilized for Stability — Shipped cold-packed, intact for reconstitution
Molecular Weight
Third Party Tested
APPLICATION
For Research Use only
Form
Lyophilized Powder
Storage
-20°C Long Term
Purity (HPLC)
99%+ Third Party Verified
Manufacture
USA / GMP
4.9 847 verified reviews
DSIP · 5mg
Total Price
$227.66
Discounted Price
$188.95
Vials
5 vials
You Save
$38.71
17% OFF
Select Strength (mg)
99% HPLC Purity
Select Vials
Bulk pricing applied
📈 Upgrade to 10 vials and save an extra vs. buying 5 — nearly 3 free vials.
Select Purchase Option:
-
99%+ HPLC Purity —
Independently verified by accredited US laboratory
-
Endotoxin-Screened —
LAL tested, LPS-free, endotoxin report available
-
GMP-Certified Manufacturing —
USA facility, ISO 9001:2015
-
Lyophilized for Stability —
Shipped cold-packed, intact for reconstitution
Molecular Weight
Third Party Tested
APPLICATION
For Research Use only
Form
Lyophilized Powder
Storage
-20°C Long Term
Purity (HPLC)
99%+ Third Party Verified
Manufacture
USA / GMP
DSIP is a research peptide used in laboratory studies of peptide signaling, receptor interactions, and neurochemical pathways in controlled experimental systems. This product is supplied strictly for research use only. DSIP 5mg is not approved or intended for human or animal use, and any discussion of biological activity refers only to preclinical or in vitro research.
DSIP at a glance
| Sequence | Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu |
|---|---|
| Molecular formula | C₃₅H₄₈N₁₀O₁₅ |
| Molecular weight | 848.824 g/mol |
| CAS number | 62568-57-4 |
| PubChem CID | 68816 |
| Application | Research use only |
What is DSIP?
DSIP is a laboratory research material used to investigate peptide structure, signaling behavior, and pathway responses in controlled experimental models. References to biological effects are provided for scientific context only and must not be interpreted as claims of therapeutic, diagnostic, or clinical benefit. This product is not offered for human or veterinary use.
Why is DSIP studied?
DSIP entered the literature in 1977, when Schoenenberger and Monnier isolated and characterised a nonapeptide from cerebral venous blood and named it for the delta-EEG activity they were tracking.3 It is studied today mainly as a historically important, structurally simple neuropeptide: nine residues, no disulfide bridge, and an unusually well-documented isolation record.4
How is DSIP studied in the lab?
No single high-affinity DSIP receptor has been cloned, so mechanistic work is done indirectly — radiolabelled-peptide binding to brain membrane preparations, stability and transport measurements, and immunoreactivity mapping across tissues. The 1984 Neuroscience & Biobehavioral Reviews survey collected that body of work and remains the reference point for what is and is not established about the peptide.4
What has preclinical research reported?
DSIP may be used in laboratory studies involving peptide signaling, cellular communication, pathway modeling, and assay development. All uses are limited to research settings only. This product is not intended for diagnosis, treatment, prevention, or consumption.
Isolation and characterisation (1977)
The originating PNAS report described the isolation and chemical characterisation of the delta-EEG-inducing nonapeptide from cerebral venous blood.3
Review of the preclinical record
Graf and Kastin’s 1984 review compiled the DSIP literature to that date, including binding, distribution and stability findings in animal preparations.4
Forms studied and handling
The material is supplied as a lyophilized (freeze-dried) powder. Freeze-drying is used for peptides because removing water suppresses the hydrolysis and aggregation routes that dominate degradation in solution, and the resulting amorphous solid is far more stable on storage than the corresponding liquid.5 Reported degradation routes for peptides in the solid state include deamidation of asparagine and glutamine residues, oxidation of methionine and tryptophan, and physical aggregation, all of which are accelerated by residual moisture, elevated temperature and repeated freeze-thaw cycling.6 Sealed vials are therefore held at −20 °C, protected from light, and reconstituted material is kept cold and used within a short working window. For laboratory research use only.
References
- Schneider-Helmert, D., Gnirss, F., Monnier, M., Schenker, J., & Schoenenberger, G. A. (1981). Acute and delayed effects of DSIP (delta sleep-inducing peptide) on human sleep behavior. International journal of clinical pharmacology, therapy, and toxicology, 19(8), 341–345. PMID 6895513
- Bes, F., Hofman, W., Schuur, J., & Van Boxtel, C. (1992). Effects of delta sleep-inducing peptide on sleep of chronic insomniac patients. A double-blind study. Neuropsychobiology, 26(4), 193–197. https://doi.org/10.1159/000118919. PMID 1299794
- Schoenenberger GA, Monnier M. Characterization of a delta-electroencephalogram (-sleep)-inducing peptide. Proceedings of the National Academy of Sciences. 1977;74(3):1282-1286. doi:10.1073/pnas.74.3.1282
- Graf MV, Kastin AJ. Delta-sleep-inducing peptide (DSIP): a review. Neuroscience & Biobehavioral Reviews. 1984;8(1):83-93. doi:10.1016/0149-7634(84)90022-8
- Wang W. Lyophilization and development of solid protein pharmaceuticals. International Journal of Pharmaceutics. 2000;203(1-2):1-60. doi:10.1016/S0378-5173(00)00423-3
- Manning MC, Chou DK, Murphy BM, et al. Stability of protein pharmaceuticals: an update. Pharmaceutical Research. 2010;27(4):544-575. doi:10.1007/s11095-009-0045-6
For laboratory research use only. Products on this website are intended solely for in-vitro research. They are not medicines, have not been evaluated by the FDA, and are not intended to diagnose, treat, cure, or prevent any disease. Any administration to humans or animals is strictly prohibited.
What are these peptides made for?
Our peptides are produced exclusively for laboratory and scientific research purposes.
Licensed Peptides™ products are developed using industry-standard synthesis and purification protocols, making them suitable for in vitro research, analytical testing, and experimental models.
Research-grade standards
- Synthesized via Solid Phase Peptide Synthesis (SPPS)
- Purified using advanced HPLC methods
- Verified through analytical quality control processes
- Screened for heavy metals and endotoxins
Consistency across batches
Strict process controls ensure reproducibility, allowing researchers to work with confidence across experiments.
Applications
Our peptides are commonly used in research involving:
- Cellular signaling pathways
- Tissue remodeling and repair mechanisms
- Extracellular matrix regulation
- Molecular biology and biochemical studies
All products are intended for research use only and are not for human or animal consumption, therapeutic use, or clinical application.
Why buy from Licensed Peptides
At Licensed Peptides™, quality isn’t a claim — it’s a controlled, repeatable process.
Every peptide we produce follows a strict, pharma-grade workflow designed to ensure purity, stability, and consistency from synthesis to delivery.
What sets us apart
ISO-certified cleanroom manufacturing
All peptides are synthesized in sterile, controlled environments to eliminate contamination risk and ensure batch consistency.
>99% verified purity (HPLC tested)
We use advanced High-Performance Liquid Chromatography (HPLC) to separate and verify peptide purity with precision.
Comprehensive safety testing
Each batch undergoes heavy metal and endotoxin screening to ensure it is free from hidden contaminants.
Pharma-grade raw materials
We start with rigorously tested amino acids and reagents, ensuring integrity at the molecular level.
Lyophilized for stability
Freeze-dried peptides maintain long-term stability, potency, and reliability for research applications.
Nitrogen-sealed vials
Every vial is protected from oxygen and moisture, preserving structural integrity during storage and transit.
Built for serious research
From synthesis to delivery, every step is engineered to meet the expectations of professionals who require accuracy, consistency, and reliability.
For laboratory research use only. Not for human or veterinary use.
How orders ship
We understand that timing and product integrity are critical for research.
| Ships to | United States (including minor outlying islands) |
|---|---|
| Processing days | Monday to Friday, excluding holidays |
| Daily cut-off | Paid orders placed before 4:00 PM PST are typically shipped the same business day |
| Free shipping | FedEx 2-Day Express on orders over $200 and for VIP members |
| Standard | USPS Ground Advantage, 3–7 business days (not guaranteed) — $8.95 |
| Expedited | FedEx 2-Day $11.95 · UPS 2-Day $19.95 · FedEx Next Day $44.99 |
| Signature | Required on delivery for orders of $1,000 or more |
How orders are handled
Cold chain protection
Products are stored in industrial-grade freezers prior to shipment to maintain stability and purity.
Secure & protective packaging
Each order is carefully packed to protect against temperature fluctuations, moisture exposure, and physical damage during transit.
Tracking
Once your order has shipped you will receive a tracking number by email, so you can monitor delivery progress.
Shipped from the United States
Orders are dispatched domestically from a U.S.-based operation, so there are no international customs steps.
Delivery times
Shipping times are estimates and begin after order processing. Delays may occur due to carrier issues, weather, or other unforeseen factors, and delivery dates are not guaranteed. Full terms are in our Shipping & Delivery Policy.
For laboratory research use only. Not for human or veterinary use.
Additional information
| pack | 1 pack, 3 pack, 5 pack, 10 pack |
|---|
Storage conditions at a glance
| Lyophilized, in transit | Stable for shipping for up to 3–4 months |
|---|---|
| Lyophilized, short term | Room temperature is usually adequate for several weeks; refrigeration under 4°C (39°F) is generally acceptable |
| Lyophilized, long term | Freezer at -80°C (-112°F) for several months to years |
| After reconstitution | Refrigerated; stable for up to 30 days |
| Light and moisture | Keep cold and away from light in the original sealed vial |
Why the powder is stable
All of our products are manufactured using the lyophilization (freeze drying) process, which keeps them stable for shipping for up to 3–4 months.
Lyophilization is a unique dehydration process, also known as cryodesiccation, where the peptides are frozen and then subjected to low pressure. This causes the water in the peptide vial to sublimate directly from solid to gas, leaving behind a stable, crystalline white structure known as lyophilized peptide. The puffy white powder can be stored at room temperature until it is reconstituted with bacteriostatic water.
Storing vials on arrival
Once peptides have been received, it is imperative that they are kept cold and away from light. If the peptides will be used in the next several days, weeks or months, short-term refrigeration under 4°C (39°F) is generally acceptable. Lyophilized peptides are usually stable at room temperatures for several weeks or more, so if they will be utilized within weeks or months such storage is typically adequate.
For longer term storage (several months to years) it is more preferable to store peptides in a freezer at -80°C (-112°F). When storing peptides for months or even years, freezing is optimal in order to preserve the peptide’s stability.
After reconstitution
Once the peptides are reconstituted with bacteriostatic water, they must be stored in the fridge to maintain stability. After reconstitution, the peptides will remain stable for up to 30 days.
For laboratory research use only. Not for human or veterinary use.
99%+ — Passes ≥99% 
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99%+ Every Batch
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