AOD-9604

AOD-9604 is derived from the C-terminal region of human growth hormone (amino acids 176–191). By using only this fragment, the original researchers sought to separate the fat metabolism aspect of growth hormone from its growth-promoting effects.

Mechanism of action under investigation

Research is being carried out into AOD-9604 in relation to lipolysis — the breakdown of fats — and to fat metabolism in general. The fragment was designed to study these processes without the effects on blood sugar or IGF-1 associated with full-length growth hormone.

These mechanisms are derived from pre-clinical and early-stage clinical research and describe the research context; they do not represent proven effects in humans.

The fragment comprises only the final part of the growth hormone molecule. It was precisely by isolating this small, well-defined part that the researchers hoped to study fat-related processes separately from the broader effects of the full growth hormone. This makes AOD-9604 a clearly defined subject of study.

The extra tyrosine at the start of the fragment was added to make the molecule more stable and easier to measure in analyses — a detail that illustrates just how carefully peptide fragments are designed for research.

AOD-9604 was developed in the 1990s by researchers at Monash University in Australia. It is one of the few research peptides for which a relatively large amount of clinical data is available.

• Research focus: lipolysis and fat metabolism (preclinical and clinical).
• Research focus: distinguishing the effects of fat from the growth effects of growth hormone.
• Research focus: safety and tolerability profile.

Status of human research

It is important to be honest about the results: although early, small-scale studies showed modest effects, the largest clinical trial (Phase 2b) failed to demonstrate any statistically significant fat loss. AOD-9604 was therefore discontinued as a drug candidate in 2007 and has not been approved as a medicine. In the studies conducted, its safety profile was comparable to that of a placebo. As a research compound, AOD-9604 remains of interest, but solely within a research context and without any claims regarding its effects.

The relatively substantial amount of clinical data makes AOD-9604 unusual amongst research peptides: for most peptides, there is hardly any human research available. This story illustrates just how important large, well-designed studies are — modest early results did not hold up in the largest trial. You should therefore assess a compound on the basis of the quality and scope of the underlying evidence, not on its popularity.

AOD-9604 is supplied as a lyophilised powder and is reconstituted in the laboratory using bacteriostatic water. The steps below describe only the laboratory procedures for research purposes.

1. 1Allow the vial and the bacteriostatic water to reach room temperature.
2. 2Wipe the rubber stoppers of both vials with an alcohol wipe.
3. 3Allow the bacteriostatic water to run slowly down the side of the vial; do not direct it straight onto the powder.
4. 4Gently swirl the vial until everything has dissolved; do not shake.
5. 5Store the solution in the fridge and label it with the date and batch number.

You can find supplies such as bacteriostatic water, insulin syringes and alcohol wipes under ‘Lab & Accessories’. This is a laboratory instruction and does not constitute dosage advice for consumption.

Combining approaches in research

In metabolic research, AOD-9604 is sometimes studied alongside other compounds such as MOTS-C. Document each compound separately, specifying its purity and batch number, so that any observed effects remain traceable.

Store AOD-9604 in powder form in a cool, dark place to ensure maximum stability.

Practical storage tips

• Powder form: freezer (-20 °C) for long-term storage; fridge (2–8 °C) for short-term storage.
• After reconstitution: store refrigerated (2–8 °C) and use within a few weeks.
• Avoid direct light, heat and repeated temperature changes.
• Write the reconstitution date and batch number on the vial.

Careful storage preserves the purity of the research material.

Before use, check the vial to ensure it is clear and that the packaging seal is intact.