Additional compounds
Dihexa
Dihexa is a small lab-made chemical. Its design is based on a piece of another chemical chain called angiotensin IV. Its proposed action remains uncertain.
For laboratory research only. Not for human consumption or veterinary use.
The research, at a glance
What researchers study
An idea about nerve-cell connections whose key supporting paper was withdrawn.
What the study found
The linked record is a notice that the earlier HGF/c-Met paper was withdrawn in 2025. It warns about the evidence; it does not support the earlier claim.
Retraction notice.
Read the retraction notice (opens a new tab)What is still unknown
A retracted paper cannot support a confident mechanism or memory-benefit claim.
How it works, in plain words.
Nerve cells are tiny living parts that pass messages to one another. An earlier idea said Dihexa changed a message involved in making connections between them. But a key paper was retracted in 2025. Retracted means withdrawn from the research record. That paper cannot be treated as proof that the idea is true.
The idea behind it
The proposed message was HGF. It attaches to a protein called c-Met and can start steps inside a cell. The withdrawn paper linked Dihexa to this process and to changes in nerve-cell connections.
Why that matters
A withdrawn paper changes how a claim must be read. The old explanation is still a hypothesis, which means an idea to test. Sound new evidence would be needed before presenting it as an established explanation.
What do the science words mean?
- Cell
- A tiny living part of tissue. A cell takes in materials, does chemical work and responds to its surroundings.
- Protein
- A chain of small building blocks folded into a shape that does a job, such as carrying a message or helping a reaction.
- Peptide
- A short chain of amino acids. Amino acids are small chemicals that join together, like beads on a string.
- Molecule
- A tiny group of atoms joined together. Water is made of water molecules. Different groups can do different jobs.
- Hormone
- A chemical message made in one place that can change what cells do somewhere else.
- Receptor
- A protein that starts steps inside a cell when a matching chemical attaches. It can be on the cell’s surface or inside it.
- Enzyme
- A protein that helps turn one chemical into another more quickly, like helping break a large piece into smaller pieces.
- Cell study
- A test on cells grown outside the body. It is not a trial in people.
- Animal study
- A test in animals under set conditions. Its results may not carry over to people.
- Hypothesis
- An idea that still needs testing.
- Batch report / COA
- A report about a sample from one batch. It does not prove a health benefit.
What the research says
Here is a starting point from the linked sources. A study about a compound is not a test of the supplier’s product.
Retraction notice
An important change to the evidence
The linked record is a notice that the earlier HGF/c-Met paper was withdrawn in 2025. It warns about the evidence; it does not support the earlier claim.
What this does not show
A retracted paper cannot support a confident mechanism or memory-benefit claim.
Product details
- Product name
- Dihexa
- Also found in research as
- PNB-0408
- What is in it
- Dihexa is a small lab-made chemical. Its design is based on a piece of another chemical chain called angiotensin IV. Its proposed action remains uncertain.
- Product form
- One named compound
- Amount and concentration
- Check the chosen size and current label on the partner’s page. We do not assume one amount for every size.
- Batch testing
- Match the lot number on the container to its certificate of analysis (COA), the batch test report.
- Storage
- Follow the current label and the lab’s approved procedure. Dry powder and prepared liquids may need different conditions.
Check the batch, not just the name.
A batch report describes a sample from one batch. Check that its lot number matches the product. A purity number does not prove safety or a health benefit.
Find the partner’s batch reports (opens a new tab)Common questions
What do the studies tell us about Dihexa?
A retracted paper cannot support a confident mechanism or memory-benefit claim.
Does the product name prove what is in the container?
No. Match the exact name, form and amount on the label. Then check the report for that batch. Similar names can refer to different molecules.
What does a purity number mean?
It describes a result from a particular test on a sample. It does not mean the product is safe, suitable for personal use or proven to have a health effect.
Why do some sources use harder words?
Research papers describe exact methods and results. We explain the main ideas here. Open the linked paper for the full details, including what was tested and the study’s limits.
Can the calculator tell me how to use this product?
No. It checks math from numbers you enter. It does not choose a dose, a mixing method or a way to use a product.
Follow the sources
Open the papers for their exact methods and results. Background research and evidence gaps are labeled below.
- Retraction noticeRetraction notice for the 2014 HGF/c-Met paper (opens a new tab)
Retraction notice, not evidence supporting the proposed mechanism.
Product label and purchasing
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Check the math with the right calculator for this product. It does not choose a dose or tell you how to use it.
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