Bodybuilding Peptides

Bodybuilding is a very competitive industry and those actively training, who are serious about getting shredded often find themselves steered towards the use of muscle peptides.

Bodybuilding peptides have the ability to replicate certain hormones in the body to signal and trigger a desired muscular response. Particularly as one ages, the ability to build lean muscle may be sabotaged by a hormonal deficiency. This is where peptides offer a viable solution and benefits. 

achieving muscle growth


Bodybuilding peptides achieve muscle growth by triggering the liver to release of IGF-1 into the blood.

GH also triggers IGF-1 production within cells.

achieving muscle growth


IGF-1 has primarily proliferative effects, which means it stimulates cell multiplication (hyperplasia) as well as an increase in the size of the cell (hypertrophy) (Adams 2002, Munteanu 2004, Zingg 2004).
achieving muscle growth


Growth Hormone levels in the blood are controlled by a negative feedback mechanism.

GH and IGF-1 levels in the blood inhibit GHRH release from the hypothalamus, increase SST release from the hypothalamus, and decrease GH release from the pituitary gland (Patrie 2004, Veldhuis 2001).

These changes decrease GH production until blood levels decrease and the negative feedback is removed.

achieving muscle growth


Growth hormone has the additional benefit of stimulating connective tissue growth around the muscle (fascia, ligaments, tendons).

This improves the connective tissue’s recovery and repair after high-intensity training, and decreases the risk of overuse injury (tenosynovitis, tendinosis).

The Distinction between Peptides and Steroids:

Apart from being a natural and much safer option to steroids, peptides:

Steroids increase the size of already existing muscle cells, resulting in:
  • Greater bulk
  • Less definition
  • Low quality, artificial, temporary muscle
Grow new muscle cells i.e. increase the number of muscle cells, resulting in greater:

Growth factors that participate in Muscle Growth

IGF-1 (Insulin Like Growth Factor-1)

  • IGF-1 is highly anabolic
  • IGF-1 plays a key regulatory role in muscle growth
  • IGF-1 stimulates the proliferation of satellite cells.


  • Enhances satellite cell fusion and increases cell density
  • Insulin promotes the formation of muscular myotubes and enhances differentiation
  • Supports muscle protein synthesis (hypertrophy)
  • Insulin promotes blood vessel dilation which improves the circulation of nutrients to the injury site
  • Increases the amount of muscle glycogen that gets stored in the muscle tissue


  • Testosterone has been shown to increase the levels of neurotransmitters at the site
  • Testosterone stimulates GH secretion and interacts with the receptors in DNA
  • Testosterone modulates the activity of the satellite cells by increasing IGF-1 production and the density of androgen receptors


  • Growth hormone stimulates the production of IGF-1
  • GH plays a key role in the uptake and integration of amino acids into the new muscle proteins
  • GH is also believed to promote myogenesis which is the formation of muscle tissue.

 Bodybuilding Peptides :

• Growth Hormone Stimulating Peptides
• Growth Hormone Releasing Peptides

Bodybuilding peptides for muscle growth are available by prescription in Australia.

High-Intensity Training and its Effect on Muscle Growth

  • Bodybuilding and weight training will stimulate more contractile protein.
  • More contractile protein will then lead to further muscle nuclei (myonuclei) to function properly.
  • The inactive stem (or satellite) cells around the muscle fibre then have the ability to be stimulated to fuse with the muscle fibre.
  • It can then differentiate into myonuclei, and help produce and support the additional contractile proteins.
  • High-intensity training is highly effective at both stimulating increased contractile protein, alongside supplying myonuclei to maintain cellular function.
  • Maintaining the correct growth hormone and testosterone levels can also achieve this.
Bodybuilding, growth hormone and muscle growth

How to Increase / Gain Muscle Mass

  • In order to increase muscle size and strength there must be improvements made to the neurological control of the muscle cells. This improvement is made by way of the brain and spine.
  • The brain sends signals along the motor pathways communicating to the muscles when, how rapid and powerfully they should contract in order to move.
  • This neurological control is achieved through the sequence of frequent high-intensity repetitions of a particular movement.
  • Each movement results in changes in nerve connections and activation thresholds.
  • Muscle growth occurs primarily by the production of extra contractile proteins within the muscle cells, a process called muscle hypertrophy.
  • There is also a small increase in the number of muscle cells, a process called hyperplasia

Peptides Australia – Order Online for Local Delivery

Build Lean Muscle Mass with Peptides

Muscle Growth on the Cellular Level.

  • In a matter of hours post-workout, white blood cells called neutrophils and macrophages, enter the injured muscle to reduce inflammation on site.
  • Cell signalling proteins called cytokines are also released, which in turn attract more white blood cells and satellite cells.
  • Upon being signalled, satellite cells wake up from a relatively dormant state to proliferate at the site of the muscular injury. Satellite cells regulate gene expression, and they possess a single nucleus.
  • The tissue damage prompts cellular replication and differentiation of the satellite cells into mature muscle cells by fusing to the existing muscle fibres.
  • This new muscle protein strand will facilitate muscular repair.
  • As training continues, satellite cells will continue to heal damaged muscles; flooding injured fibres with satellite cells. The cells will need to become part of the cell cycle in which the replication of molecular pathways takes place.
  • Signalling pathways ultimately regulate activation and expansion of satellite cells, resulting in the production of bigger, stronger muscles.

The body needs to be in an environment conducive to healing and growth for satellite cell activation.

Free online workout plan! PK Performance is offering PeptideClinics customers an exciting new workout plan. Check it out!
Gain Access to further information regarding our Muscle Growth supplements