Pen Peptide
YK-11 (Myostatin) | 35mg/1,5ml
YK-11 (Myostatin) | 35mg/1,5ml
Pre-Mixed Stabilized Pen
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- 🥇 The first peptide brand with Pre-Mixed Pen stabilized formulations
- 📦 We ship with DHL Express in thermo-insulated packaging
- 💳 Secure payment by card or bank transfer
- 🧪 Purity ≥98% for precise research protocols
✅ Proper storage
✅ Proper storage
To ensure the optimal quality of our products, we pay special attention to the delivery and storage of peptides. All our shipments are sent in special cooling boxes that maintain the required temperature during transportation. This guarantees that the products will reach you in perfect condition.
After receiving the peptides, it is important to store them properly to preserve their stability and effectiveness. We recommend storing them at a temperature between 2°C and 8°C in a refrigerator. This ensures that the peptides retain their properties throughout their shelf life.
✅ Order and Delivery
✅ Order and Delivery
At Pen Peptide, we ensure fast and secure delivery of your order with DHL Express, maintaining the highest quality and reliability throughout the process.
How we process your order:
Once your payment is confirmed via bank transfer or debit/credit card, we dispatch your order on the next business day.
Orders are carefully packaged in temperature-controlled cooling boxes to ensure product integrity during transportation.
Delivery timeframe:
Standard delivery time within the Europe & UK: 1 to 3 business days (typically 1-2 business days for most locations).
Deliveries are handled exclusively by DHL Express, providing a fast and reliable shipping experience.
Tracking & order confirmation:
After your payment has been successfully processed, you will receive an email confirmation with your tracking number.
You can use the provided tracking link to monitor your shipment’s progress and estimated delivery time.
With Pen Peptide, you can trust that your order will arrive quickly and in perfect condition, ensuring a seamless and efficient experience.
✅ How does the pen work?
✅ How does the pen work?
The peptide pen is an innovative and easy-to-use device, designed for precise dosing of the substance in research settings. It is a pre-mixed pen (Pre-Mixed Pen), which means it contains an already dissolved peptide in an optimal concentration, ready for use.
Key features of the pen:
- Precision – Each pen is pre-dosed, ensuring accurate and consistent application.
- Ease of Use – No dilution or additional preparation is required.
- Sterility and Safety – Each product is manufactured in controlled laboratory conditions and sterile-packaged to guarantee its purity and effectiveness.
How to use the pen?
- Attach the needle by placing it onto the pen and twisting until fully secured.
- Set the desired dose – use the dosage dial by rotating the regulator to the corresponding number, which represents the selected units. The numbers displayed range from 0 to 60, indicating the units for dosing.
- Administer the dose according to the requirements of your research.
- Store the pen properly – in a refrigerator at a temperature between 2°C and 8°C to maintain the stability of the peptide.
With the pre-mixed pen from Pen Peptide, the process is simplified, efficient, and safe, ensuring optimal results for your research.
✅ Why choose Pen Peptide?
✅ Why choose Pen Peptide?
If you are looking for peptides of the highest quality with over 98% purity, Pen Peptide is one of the best places where you can easily and securely order online. At Pen Peptide, we specialize in the synthesis of highly purified peptides intended exclusively for Research & Development Use Only.
Our peptides are produced in certified GMP laboratories, adhering to strict standards of quality, safety, and control. Each product undergoes rigorous testing for purity and stability to ensure you receive research materials with verified origin and maximum effectiveness.
We understand how important fast and reliable service is for our customers. That’s why we offer express delivery within 1 to 3 business days. All shipments are securely packaged to maintain product quality during transportation.
✅ Molecular Structure Stabilization Process Technology (MSSPT)
✅ Molecular Structure Stabilization Process Technology (MSSPT)
The Molecular Structure Stabilization Process Technology (MSSPT) focuses on preserving the structural integrity and functionality of molecules under harsh conditions and during prolonged storage periods. This process may involve modification of the molecule itself, optimization of storage conditions, or the use of auxiliary components that protect the molecules from degradation.

Key stages of the process:
1. Molecular modification:
Chemical and genetic engineering: Involves altering the structure or composition of the molecule to make it more resistant to degradation. For example, protein cross-linking can prevent unfolding, or modification can reduce susceptibility to chemical reactions.
Chemical modification: The introduction of protective groups or changes to reactive sites can prevent unwanted chemical reactions and degradation.
2. Optimization of storage conditions:
Lyophilization (freeze-drying): This method removes water from the sample, helping to preserve structure and prevent degradation during storage.
Storage in specialized containers: Using containers that protect from light and oxygen can safeguard molecules from photodegradation or oxidation.
Controlled-release systems: These systems provide a steady concentration of the therapeutic molecule, but introduce additional challenges related to stabilizing molecules over extended release periods.
3. Use of auxiliary components:
Buffers: Buffers help maintain stable pH levels, which are crucial for many chemical reactions and biological processes.
Antioxidants: These additives can prevent or reduce oxidative degradation, which is a common cause of molecular instability.
Stabilizing agents: These help prevent aggregation, precipitation, or other forms of degradation.
4. Understanding molecular interactions:
Thermodynamic equilibrium: A fundamental understanding of the interactions between a molecule and its environment is essential for developing effective stabilization strategies.
Detergents for membrane proteins: Specialized detergents, such as those developed to stabilize membrane proteins, help maintain their structure in solution.
Molecular simulations: Techniques such as molecular dynamics can provide valuable insights into the stability and behavior of molecules.
5. Examples of stabilization techniques:
Protein stabilization: Strategies include forming disulfide bonds, using stabilizing agents or chaperones, and introducing stabilizing mutations.
Polymer stabilization: Methods include the addition of antioxidants or the use of modified clay minerals that prevent polymer degradation.
Propellant stabilization: Stabilizers are essential to prevent the decomposition of propellants and ensure their safe and reliable performance.
Pen Peptide – Proven Molecular Stabilization
Our peptide pens are developed with a strong focus on preserving the biological activity and structural stability of the active compounds. Thanks to thoroughly researched stabilization processes—including optimization of storage environments and precise modification of molecular structure—we achieve long-term durability and reliability of the peptides under appropriate storage conditions.
The MSSPT (Molecule Structure Stabilization Process Technology) we use incorporates various approaches to maintain molecular integrity, including the use of suitable buffers, antioxidants, and stabilizing agents. The MSSPT technology allows for the integration of multiple active molecules into a compact volume without compromising their structural integrity or biological effectiveness. Additional optimization of storage conditions—such as pH control and prevention of photodegradation and oxidation—ensures maximum stability and bioactivity of the peptides.
These precise measures guarantee that the final product remains effective and stable even after extended storage periods, making it a secure and reliable option for use in various research protocols.
What Is YK-11?
YK-11 is a synthetic compound classified as a Selective Androgen Receptor Modulator (SARM), distinguished by a structure based on dihydrotestosterone (DHT). Developed to explore its effects on muscle mass and androgenic activity, YK-11 stands out as a unique agent that combines androgen receptor modulation with potential myostatin inhibition. This dual function differentiates it from other SARMs and makes it a subject of increasing scientific interest in the fields of molecular biology and muscle regulation research.
How Does YK-11 Work?
YK-11 interacts with androgen receptors and activates specific genetic pathways associated with muscle hypertrophy. A key feature of its mechanism is its ability to increase levels of follistatin—a natural protein that suppresses the activity of myostatin. Myostatin is a major regulator that inhibits excessive muscle growth. Through the balanced suppression of this pathway, YK-11 creates favorable conditions for enhanced muscle protein synthesis while maintaining selectivity for androgen receptors. This makes it particularly valuable for studies focused on optimizing muscle function and physiology.
Scientifically Supported Potential Benefits of YK-11
YK-11 has generated significant interest in research communities due to several observed effects that may be relevant to muscle growth and regulation. These include:
- Enhanced muscle growth through androgen receptor modulation;
- Increased follistatin production and subsequent myostatin inhibition;
- Improved muscle density and pronounced anabolic response;
- Potential support for strength gains and recovery processes;
- Tissue-selective activity with minimal systemic impact on other organs.
These effects are under continued investigation through advanced laboratory analyses aiming to deepen the understanding of molecular mechanisms involved in muscle regulation.
YK-11 vs Other SARMs
YK-11 differs from other Selective Androgen Receptor Modulators (SARMs) through its unique DHT-derived structure and its ability to influence follistatin—a natural myostatin inhibitor. This additional mechanism places it in a distinct category when compared to conventional SARMs such as Ostarine (MK-2866), RAD-140, and S23.
Compared to Ostarine, YK-11 demonstrates significantly stronger anabolic potential, albeit with greater need for monitoring and control. While Ostarine is typically favored for longer, lighter research protocols, YK-11 is primarily used in short-term cycles with an intensive focus on muscle growth.
In contrast to RAD-140—also known for its strong anabolic effects—YK-11 offers an added benefit via its ability to upregulate follistatin, a mechanism not found in RAD-140. This gives YK-11 an advantage in studies targeting maximal suppression of myostatin, a key factor limiting muscle development.
When compared with S23, a highly potent SARM associated with suppression of endogenous testosterone, YK-11 provides a more unconventional yet highly effective approach to anabolic processes. Both compounds require precise dosing, but YK-11 shows promise for achieving unique outcomes in protocols aiming to surpass standard hypertrophy limits.
Due to its complex action and distinct mechanism, YK-11 is often incorporated into advanced research protocols where a combined effect of androgenic stimulation and myostatin regulation is desired.
Dosage and Application of YK-11 in Research Protocols
Suggested research protocol: 3 units once daily for 4–6 weeks, followed by a 2–4 week off-cycle.
1 unit = 23.33mcg
Total pen content: 150 units
Possible Side Effects of YK-11
Despite growing interest in its properties, YK-11 must be evaluated with care regarding its safety profile. Based on available research data, potential adverse effects may include:
- Suppression of natural testosterone production;
- Androgenic effects with extended use;
- Limited data on long-term safety.
Maintaining appropriate dosage and strict control over cycle duration are essential to minimize the risk of unwanted effects.
For laboratory purposes and personal observation only.
For laboratory purposes and personal observation only.
The information has been collected from numerous studies and analyses conducted over the years and is not intended for diagnosing, treating, or preventing any diseases.
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