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01/05/2026

The Use of Peptides in Health, Performance and Longevity

Younger Longer Position Statement: The Use of Peptides in Health, Performance and Longevity. At Younger Longer we take an evidence based and safety-first approach to emerging health interventions. Peptides are short chains of amino acids that act as signalling molecules in the body. Some peptide-based therapies such as insulin and GLP-1 medications are well established and approved for specific medical conditions following rigorous testing for safety quality and efficacy. However, the growing use of peptides for anti-ageing, fat loss, muscle gain and general “biohacking” has moved ahead of the available scientific evidence.
Dr Geoff Holt
Written by Dr Geoff Holt
The Use of Peptides in Health, Performance and Longevity

The Use of Peptides in Health, Performance and Longevity

Younger Longer Position Statement: The Use of Peptides in Health, Performance and Longevity


At Younger Longer we take an evidence based and safety-first approach to emerging health interventions. Peptides are short chains of amino acids that act as signalling molecules in the body. Some peptide-based therapies such as insulin and GLP-1 medications are well established and approved for specific medical conditions following rigorous testing for safety quality and efficacy.

However, the growing use of peptides for anti-ageing fat loss muscle gain and general “biohacking” has moved ahead of the available scientific evidence.

1. Evidence Based Efficacy
Outside approved medical use the evidence supporting peptides is limited.
Claims relating to fat loss, muscle growth, anti-ageing and recovery are largely unproven or not supported by strong human clinical trials. Much of the research is based on animal studies, early phase trials or anecdotal reports. Even where physiological effects are observed such as increased growth hormone activity, these may come with side effects and uncertain long-term outcomes.

Position: Peptides should not be considered a reliable or evidence-based tool for general health optimisation longevity or performance enhancement outside approved medical use.

2. Safety Profile
There are significant gaps in the safety data for many peptides currently being marketed.
Unapproved peptides have not been assessed by regulators for safety, quality or effectiveness. Reported risks include immune reactions, hormonal disruption, infection from injection practices, contamination, incorrect dosing and unknown long-term effects including potential impacts on cancer, cardiovascular and metabolic health.

Australian regulators including Therapeutic Goods Administration have raised concerns about the safety of unregulated peptides.

Position: The safety of most non approved peptides remains uncertain and their use carries potential health risks.

3. Regulatory Status in Australia
Australia has strict controls around peptide use.
Most peptides are classified as prescription only medicines and can only be used when prescribed by a qualified medical practitioner for a legitimate clinical reason. 

The importation, supply or use of unapproved peptides without proper authority is illegal.
Despite this, there has been a rise in online sales and unregulated supply which increases the risk of unsafe products reaching consumers.

Position: Use of peptides outside appropriate medical prescription and supervision is unsafe and unlawful in Australia.

4. Hype Versus Evidence
The popularity of peptides has been driven by social media marketing and biohacking culture rather than strong clinical evidence.
Many claims are exaggerated or not supported by robust research. Early-stage findings are often presented as proven outcomes which can mislead consumers.

Position: Current interest in peptides exceeds the strength of the scientific evidence.

5. Younger Longer Guidance
Based on current evidence Younger Longer recommends:

  • Only use peptide therapies that are approved and prescribed by a medical professional
  • Avoid unregulated or online sourced peptides
  • Do not rely on peptides for fat loss muscle gain or anti-ageing outcomes

Focus on proven lifestyle strategies including:

  • Regular exercise
  • Mediterranean style nutrition
  • Quality sleep
  • Stress management
  • Social connection and preventative health care

Final Position
Peptides are a legitimate area of medical science with clear benefits in specific clinical settings. However their use for general health longevity and performance enhancement is not supported by strong evidence and carries safety and legal risks.

Until there is clear long-term evidence and appropriate regulation, Younger Longer does not support the routine use of peptides outside approved medical indications.

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