SNAP-8 (Acetyl Octapeptide-3): Reference Overview and Reconstitution Notes

SNAP-8 (Acetyl Octapeptide-3) is a man-made cosmetic peptide made of eight amino acids (the building blocks that form proteins). It is studied in the skin and cosmetic research category and belongs to a group of peptides looked at for how they may affect muscle activity in the skin. It is not an FDA-approved drug.

SNAP-8 (Acetyl Octapeptide-3)

What it is

SNAP-8 (Acetyl Octapeptide-3, CAS 868844-74-0) is a man-made peptide. A peptide is a short chain of amino acids, which are the building blocks that make up proteins. SNAP-8 has eight of these building blocks. It also carries a small chemical tag called an acetyl group at one end of the chain. SNAP-8 is a longer version of a well-known peptide called Acetyl Hexapeptide-3 (also known as Argireline), with two extra building blocks added onto it. It belongs to a class of cosmetic peptides studied for how they may influence muscle movement in the skin.

Research context and categorization

SNAP-8 is grouped in the skin and cosmetic research category. More specifically, it is part of a family of peptides studied in connection with topical "expression line" research. Expression lines are the fine lines that form from repeated facial movements, like smiling or squinting.

SNARE Complex and Expression Wrinkles

SNAP-8 is often discussed in relation to a group of proteins called the SNARE protein complex. Think of the SNARE complex as a tiny docking station inside cells near nerve-muscle connections. This docking station helps control the release of acetylcholine, a chemical messenger (called a neurotransmitter) that carries signals from nerves to muscles. SNAP-8 has a shape similar to a piece of that docking station called the SNAP-25 protein. Researchers study whether SNAP-8 can slip into the docking station in place of SNAP-25, possibly interfering with how it works.

That process is studied as a possible way to reduce the small muscle contractions linked to expression wrinkles. Because of this, SNAP-8 is researched in connection with the appearance of fine lines, including forehead lines, crow's feet, and glabellar lines (the lines between the eyebrows), in topical formulation research.

Clinical Limitations and Claims

These uses are still being investigated in laboratory and cosmetic-formulation research. They are not confirmed medical outcomes. SNAP-8 has not been approved by the FDA (the U.S. Food and Drug Administration, the agency that reviews and approves drugs) for any therapeutic use.

Claims of specific percentage reductions in wrinkle depth mostly come from supplier and manufacturer materials, not from independent regulatory review. They should be read as manufacturer claims rather than established facts.

Key point: SNAP-8 is an investigational cosmetic peptide with no FDA approval for any therapeutic use. Claims about wrinkle-depth reduction come from suppliers rather than from independent verification.

Status

• Regulatory status: Research-only in this context. Acetyl Octapeptide-3 is not an FDA-approved drug. It is handled as a cosmetic ingredient rather than a medicine, meaning it has no drug approval and no established therapeutic use.
• Sport status: Not specifically listed on the WADA Prohibited List (the World Anti-Doping Agency list of banned substances in sport). SNAP-8 is a topical cosmetic peptide with no recognized whole-body or performance-enhancing action. It does not appear as a named substance under WADA classes. Because WADA also uses broad catch-all language and updates the list each year, anyone competing under anti-doping rules should check current status through an official resource such as Global DRO rather than relying on this note.

Reconstitution notes (general)

For lyophilized (freeze-dried) research powders, concentration is calculated by dividing the milligrams of peptide in the vial by the millilitres of liquid added.

For example, 10 mg of powder dissolved in 2 mL of bacteriostatic water gives a concentration of 5 mg per mL. To work out a target volume for any vial size and desired concentration, use the calculator at peptide calculator.

Dilution and handling notes (compound-specific)

Lyophilized Powder Dissolution

SNAP-8 is highly water-soluble, meaning it mixes easily into water. This sets it apart from many other research peptides. When supplied as a lyophilized (freeze-dried) powder, it typically dissolves quickly and cleanly in water or bacteriostatic water. Unlike some other peptides, it does not tend to gel, turn cloudy, or clump, so no hard swirling or warming is usually needed.

Gently adding the liquid down the inside wall of the vial, then slowly turning the vial upside down and back until the powder is fully dissolved, is generally enough. Because SNAP-8 is somewhat surface-active (meaning it tends to gather at the water surface, a bit like a mild soap), running water straight onto the powder or shaking the vial hard can create a stubborn foam that traps some of the material. Adding liquid slowly and swirling rather than shaking helps avoid this.

Topical Cosmetic Solutions

SNAP-8 is mainly a topical cosmetic peptide, meaning it is made to be applied to the skin surface rather than formulated for injection. In cosmetic practice it is often sold already dissolved as a 2 percent or 5 percent water-based solution, sometimes in a blend of water and glycerin, rather than as a dry powder. This is because the goal is to mix it into the water portion of a serum, gel, or emulsion.

Formulation references point to a pH window of roughly 5.0 to 7.0 as best for stability and skin compatibility. pH is a scale that measures how acidic or alkaline a liquid is, with 7 being neutral (similar to pure water). If you are working with a ready-made solution rather than a powder, there is nothing to reconstitute. It can be diluted directly into a water-based carrier, and the reconstitution math above does not apply.

Handling and storage

• Store reconstituted or ready-made solution in the refrigerator at 2 to 8 C and away from direct light.
• Wipe the vial stopper with an alcohol swab before drawing from it, and label the vial with the mix date.
• A refrigerated working window of roughly four weeks is a common reference point for peptide solutions.
• Discard any solution that becomes cloudy or discolored, or that develops visible particles floating in it.

Related reading

• TB-500
• Testagen
• Thymalin
• How Reconstitution Works
• How Long Does a Reconstituted Vial Last?

Tools and supplies

• peptide calculator
• Bacteriostatic Water 30 ml
• Gansulin Metal Reusable Pen
• 3 ml Glass Cartridges (10-pack)
• Complete Starter Kit

Reminder: research and educational reference only. Preppin Peppers sells hardware and materials, not peptides. Not medical, dosing, or health advice, not evaluated by the FDA, and not intended for human or animal use.

Frequently asked questions

What is SNAP-8 (Acetyl Octapeptide-3) and how does it differ from Argireline (Acetyl Hexapeptide-3)?

SNAP-8 is a synthetic octapeptide (CAS 868844-74-0) with an N-terminal acetyl group. It extends Argireline by two amino acids and is studied for analogous SNARE-complex modulation in topical cosmetic-formulation research.

How does SNAP-8 interact with the SNARE protein complex at the cellular level?

SNAP-8 mimics a region of SNAP-25, a core SNARE-complex protein. Researchers investigate whether it competitively occupies that site, potentially attenuating acetylcholine release at nerve-muscle junctions and reducing contraction-linked expression lines.

Is SNAP-8 FDA-approved, and does it appear on the WADA Prohibited List?

No. SNAP-8 is not FDA-approved for any therapeutic use and is classified as a cosmetic ingredient. It is not named on the WADA Prohibited List, as it has no recognized systemic or performance-enhancing action.

What the research community gets wrong about SNAP-8 (Acetyl Octapeptide-3)

• Treating it like a hard-to-dissolve peptide. SNAP-8 is highly water-soluble, so it usually goes into solution with slow swirling. Shaking the vial hard does not help and often whips up a stubborn foam that traps some of the material at the surface.
• Mixing it up with Argireline. SNAP-8 (Acetyl Octapeptide-3, CAS 868844-74-0) is two amino acids longer than Acetyl Hexapeptide-3 (Argireline). They share a research family but are different compounds with different identifiers, so labels and records should not use the names interchangeably.
• Reading supplier percentages as settled facts. Specific wrinkle-depth numbers usually come from manufacturer or supplier materials, not from independent regulatory review. Note them as vendor claims when you log a batch.
• Assuming there is always a powder to reconstitute. SNAP-8 is often supplied already dissolved as a 2 percent or 5 percent water-based solution. When you are handed a ready-made solution, there is nothing to reconstitute and the milligram-per-milliliter math does not apply.
• Ignoring the pH window. Formulation references point to roughly pH 5.0 to 7.0 for stability. Diluting a stock into a carrier that sits well outside that range can affect how the solution holds up on the shelf.

From our bench: If you reconstitute SNAP-8 powder, tell us what you saw. Add your bacteriostatic water slowly down the vial wall, swirl gently, and note how long the powder took to go fully clear, whether any foam formed at the surface, and how the solution looked after a week refrigerated. Send your measured concentration (mg per mL) and observations so we can compare notes across benches. We publish only what researchers actually record, never invented figures.

Sources

1. Bacteriostatic Water for Injection, USP , FDA/DailyMed label (0.9% benzyl alcohol)
2. Duerkop et al., Biotechnol J 2018 , Impact of Cavitation, High Shear Stress and Air/Liquid Interfaces on Protein Aggregation
3. Sigma-Aldrich (Merck) , Handling and Storage Guidelines for Peptides and Proteins
4. PubChem CID 71587832: Acetyl octapeptide-3 (SNAP-8), C42H72N16O15S
5. Shin JY et al., Ann Dermatol 2024 , dissolving microneedle patch containing acetyl octapeptide-3 (PMID 39082657)
6. Avcil M et al., J Cosmet Dermatol 2020 , bioactive peptides including acetyl octapeptide-3 on hyaluronic acid microneedle patches (PMID 31134751)