female athlete with flexed back muscles

Peptide Injections for Muscle Growth

There are many reasons why muscle growth is essential. Beyond its aesthetic advantages, more muscle translates into various benefits, including healthier aging, improved physical performance, and improved metabolic activity. 1

Peptides present an exciting world of opportunities related to muscle growth.2 Peptide therapy leverages the power of peptide proteins to achieve optimal performance out of your body. Think of peptides as a skeleton key that may unlock many different bodily processes.

Let’s take a closer look at how peptide injections might improve muscle growth, the benefits of specific peptides on muscle, and if peptide therapy is safe for you.

Peptide Therapy

From combating aging to boosting muscle development and recovery and more, peptide treatments may help you achieve a wide range of health goals. Our peptide treatments are delivered to your doorstep and self-administered in the comfort of your home.

GHK-Cu | PT-141 | Sermorelin

Order your peptides today by clicking the button below!

How peptide injections improve muscle growth

Peptide therapy enlists specific peptides to “amplify” or “focus” a corresponding response within the body.

Growth hormone plays a significant role in muscle growth and development.3

needle taking serum from bottle

This process utilizes growth hormone secretagogues (GHS), a group of peptides that stimulate human growth hormone (HGH) production and distribution. The result is a performance-enhancing effect that might supercharge healthy nutrition and exercise lifestyles.4

Peptide injections consist of synthetic and naturally occurring peptides ideally suited to help with muscle groups. Depending on your goals, there are many types to consider, which we will get into a little later.

man with a thinking cloud

Benefits of peptide therapy for muscle growth

Although the study of peptide therapy related to muscle growth is relatively new, there is already a rapidly growing amount of literature on its potential benefits. Peptide therapy may provide a host of muscle growth benefits, including:

  • Stimulate the release of growth hormone secretagogues (GHS), the trigger for increased growth hormone production5
  • Boosting growth hormone secretion
  • Improved immune function, reducing the likelihood of missing out on muscle-building activities
  • Accelerated recovery and regeneration during and in between workouts6
  • Increased IGF-1 levels
  • Improved appetite through the activation of ghrelin makes it easier to achieve a caloric deficit

The field of peptide therapy and its benefits are regularly expanding. Using a combination of these powerful peptides may help with addressing multiple facets of muscle growth.

Peptide injections for muscle growth

The FDA approves many peptides for therapeutic use. Let’s take a closer look at peptides that present promising benefits for muscle growth.


Historically used to treat poor growth in children, this synthetic peptide also treats HGH deficiencies in adults. Data suggests that its ability to facilitate increased human growth hormone production may provide benefits such as improved lean body mass, increased insulin sensitivity, and improved libido.

medicine vials with a syringe


Used to reduce excess fat around the stomach in patients undergoing HIV treatment, the synthetic peptide Tesamorelin is made from growth hormone-releasing factor (GRF). This peptide may aid in improving body composition and fat distribution in adults.

medicine vials and a glove picking one up


This natural peptide is often associated with its ability to regulate ghrelin, also known as the “hunger hormone.” It may benefit muscle growth by controlling hunger and cravings, making it easier to make dietary choices, and may also help preserve muscle tissue.7

syringe taking fluid from a vial


A synthetic peptide that acts as a ghrelin receptor agonist and promotes growth hormone secretion. In clinical trials, it showed a significant increase in lean body mass.

8 It also may increase appetite, producing a caloric surplus needed for muscle growth.

Muscle Growth Peptide used by a bodybuilder


Another growth hormone-releasing peptide, Alexamorelin is a synthetic molecule that operates predominantly with the central nervous system.9 Alexamorelin affects the secretion of hormones such as cortisol, prolactin, somatotrophs, and adrenocorticotropin, all of which can affect muscle growth.

Close-up of a single branch with two leaves on the end of it.


A synthetic peptide that has shown effectiveness at changing body composition, Hexarelin also affects the body’s production and release of growth hormone. Subjects that incorporated hexarelin saw a drop in body fat while increasing lean mass.10

Measuring belly after the use of peptides

Other Peptides

The field of peptide therapy is overgrowing. Every year, more data is uncovered, providing additional benefits and use cases for peptides.

While consensus is still growing, a few more peptides show promise for improving muscle growth.

  • GHRP-1
  • GHRP-3
  • GHRP-4
  • GHRP-5

A diagram of the structure of a peptide

Is peptide therapy safe?

For most people, peptide therapy is a safe solution that might produce positive changes within the body related to body composition and muscle growth. A 2018 study found that Growth Hormone Secretagogues were generally safe with few risks.15

However, as with any form of treatment, there are potential risks involved with peptide therapy. Adverse reactions to peptides are often due to the delivery mechanism. For example, products like topical creams may cause skin irritation. Injectable peptides can cause redness, swelling, or bruising at the injection site.

Although peptides are largely safe, it’s crucial to recruit the guidance of a medical professional. The FDA approves over sixty peptides; a medical professional can help you determine which will provide the maximum impact for your situation.

Final thoughts

When it comes to fitness and muscle growth, there is an abundance of information available. Sifting through the data and figuring out your goals’ best course of action can be overwhelming. Seeking the help of a medical professional can be highly beneficial to ensure safety, and a medical professional can dramatically shorten the timeframe for your muscle growth goals. They consider your medical history, current health, and the medication you are taking to determine the best course of peptide therapy for you.

The beauty of peptide therapy is that you can receive treatment in the comfort and privacy of your own home. A growing number of people are utilizing an in-home, self-injectable service like ours to save the trip to the doctor’s office and revolve treatment around their schedules. Paired with expert guidance, this is an ideal combination for many people.

If you want more information about receiving peptide therapy at home, we would love to show you ways to make it happen.

Revitalize With Peptide Therapy

Peptides are short chains of amino acids that serve as building blocks for proteins and play crucial roles in many biological functions. Combat age-related decline of peptides in your body with our scientifically formulated peptides, which offer a range of health benefits:

SERMORELIN - Boost lean muscle & reduce fat.

GHK-CU - Promote skin rejuvenation & firmness.

PT-141 - Intensify sexual desire & function.

Order today and receive your peptides at home, where you can self-administer your treatments with ease.

Peptide Shots - Frequently Asked Questions

What is included in our peptide injections?

There are many different peptide injections that we offer as part of a peptide therapy including Sermorelin and PT-141.


Sermorelin is a synthetic form of GHRH (growth hormone-releasing hormone) which controls the hGH (human growth hormone) and it’s recommended to people who have low levels of hGH. 

How do peptides improve your sleep?

Serotonin is a neurotransmitter present in the brain that releases chemicals as messages to your brain and body that it is time to go to sleep. Some peptides can interact with serotonin. Serotonin regulation issues can definitely interfere with a person's ability to have a good night's sleep.

Sermorelin is recognized for their potency as peptides that may potentially enhance sleep.

How do peptides improve immune health?

The immune response can be either blocked or stimulated to produce tolerance using peptides and peptidomimetics as immunomodulating agents.

Read more: Peptide Shots FAQ


[1] McLeod M. - Live strong and prosper: the importance of skeletal muscle strength for healthy ageing;

[2] Martinez-Villaluenga C. - Peptides for Health Benefits 2019;

[3] Tavares ABW. - Effects of Growth Hormone Administration on Muscle Strength in Men over 50 Years Old.;

[4] Wang L. - Therapeutic peptides: current applications and future directions.;

[5] Sigalos J. - The Safety and Efficacy of Growth Hormone Secretagogues.;

[6] Goldstein A. - Thymosin β4: a multi-functional regenerative peptide. Basic properties and clinical applications.;

[7] Wu CS. - Protective Effects of Ghrelin on Fasting-Induced Muscle Atrophy in Aging Mice.;

[8] Nichie K. - Anamorelin for cancer cachexia.;

[9] Handelsman DJ. - Performance Enhancing Hormone Doping in Sport.;

[10] Mosa R. - Hexarelin, a Growth Hormone Secretagogue, Improves Lipid Metabolic Aberrations in Nonobese Insulin-Resistant Male MKR Mice.;

[15] John T. S. - The Safety and Efficacy of Growth Hormone Secretagogues;