AHK (Tripeptide-3)

AHK (Tripeptide-3) – Benefits & Side Effects

AHK (Tripeptide-3) – Protocol

AHK (Tripeptide-3) – Lifestyle Considerations

Proper Peptide Storage

Why Proper Peptide Storage Matters

Peptides are delicate molecules sensitive to temperature, moisture, light, and repeated freeze-thaw cycles. Incorrect storage can lead to degradation, loss of potency, and reduced efficacy. Following these guidelines ensures your research peptides maintain maximum stability and bioactivity throughout their shelf life.

Lyophilized (Powder) Peptides

Optimal Storage:

• Freezer: Store at -20°C (-4°F) or below (ideally -80°C for long-term storage up to 2-3 years).
• Short-term: Refrigerate at 2-8°C (35.6-46.4°F) for weeks to months.
• Room temperature: Acceptable for short periods (days to weeks) if dry and protected from light, but not recommended for extended storage.
• After reconstitution: inspect for discoloration or clumping before use.

Key Practices:

• Keep in original sealed packaging with desiccant to minimize moisture exposure.
• Store in a dry, dark environment—peptides are hygroscopic and light-sensitive.
• Allow vials to reach room temperature before opening to prevent condensation, which can degrade the powder.

Reconstituted (Liquid) Peptides

Refrigeration is Essential:

• Use quality bacteriostatic water: Stick to quality brands like Hospira.
• Store at 2-8°C (35.6-46.4°F) immediately after reconstitution.
• Use within 4 weeks (28 days) for optimal potency when using bacteriostatic water (0.9% benzyl alcohol).
• Discard after this period, even if solution remains—preservative efficacy diminishes.

Important Warnings:

• Do NOT freeze reconstituted solutions—freezing denatures peptides.
• Avoid freeze-thaw cycles—they cause irreversible degradation. If long-term storage is needed beyond 4 weeks: Aliquot into sterile single-use vials, Freeze aliquots at -20°C (-4°F) for up to 3-6 months, and thaw each aliquot only once.

Handling Peptides Best Practices

1. Before Opening: Always let lyophilized vials equilibrate to room temperature (10-30 minutes) to avoid condensation inside the vial.
2. Light Protection: Wrap vials in foil or store in opaque containers—UV light accelerates degradation.
3. Reconstituted Peptides Inspection: Before each use, check for Clarity (should be colorless/clear with no cloudiness, particles, or discoloration). Discard if any issues observed.
4. Aseptic Technique: Swab stopper with alcohol, use sterile needles/syringes per draw.
5. Labeling: Mark reconstitution date on vials.

Common Peptide Storage Mistakes to Avoid

• Moisture Exposure: Never store open vials; always reseal tightly.
• Temperature Fluctuations: Avoid door storage in fridge/freezer.
• Heat/Light: Keep away from direct sunlight, heaters, or lab lights.
• Overuse of Multi-Dose Vials: Follow 28-day rule per USP/CDC guidelines.
• Freezing Liquids: Repeated cycles can reduce potency by 25%+ per cycle.

Special Peptide Considerations

• Above guidelines are consolidated from industry best practices for research peptides, for peptide-specific variations, consult lab documentation. Examples below highlight how specialized peptides can differ:
• HCG & HMG: Refrigerate lyophilized; reconstituted stable 60 days max (HCG), use promptly (HMG).
• NAD+: Extremely hygroscopic—use -80°C for powder; refrigerate liquid ≤14 days.
• PT-141: Room temp stable short-term; refrigerate reconstituted ≤1 week.

Subcutaneous Peptide Injection Protocol

Subcutaneous Peptide Injection Protocol Overview

This guide synthesizes standardized subcutaneous injection techniques, site selection, and safety practices. Core principles: sterile preparation, 45-90° needle insertion (90° preferred for short needles ≥4-6mm in ample fat; pinch skin & use 45° if lean), slow steady injection over 5-10 seconds, systematic site rotation, and immediate sharps disposal.

Preparation & Supplies

• Hand Hygiene: Wash thoroughly with soap and water.
• Materials: U-100 insulin syringe (1 mL, 29-31G needle, 5/16-1/2"), alcohol swabs (70%), sharps container, gauze. Use 30-50 unit syringes for volumes <10 units.
• Vial Prep: Wipe stopper, dry 10-30 seconds, draw dose, tap out air bubbles. Warm vials to room temperature to reduce stinging.
• Volume Limit: ≤1.5 mL per site; split larger doses (e.g., 75 IU into 3x25 IU). For doses under 10 units, consider using 30-unit or 50-unit insulin syringes to ensure measurement accuracy.

Site Selection & Rotation

Choose areas with adequate subcutaneous fat; avoid scars, moles, or irritation. Systematically rotate sites 1-1.5 inches apart; avoid same spot for 1-2 weeks. Log sites to prevent lipohypertrophy/lumping:

• Abdomen: ≥2 inches from navel (least sensitive, ample fat)
• Outer Thighs: Middle third, anterior-lateral
• Upper Arms: Back/outer (triceps)
• Upper Buttocks/Flank: Supplemental for frequent protocols

Peptide Injection Technique

Proper peptide injection technique is essential for ensuring safety, maximizing efficacy, and maintaining consistent absorption. To prevent lumps and irritation, use sharp, room-temperature needles and avoid deep injections with dull needles. Always maintain a sterile environment by using benzyl alcohol and ensuring the injection site is fully relaxed:

1. Clean site outward in circles; air-dry 30 seconds.
2. Pinch 1-2 inch skin fold to lift subcutaneous layer.
3. Insert needle at 45-90° angle (90° for ample fat, 45° for lean/thin needle).
4. No aspiration (pulling back plunger to check for blood)
5. Inject slowly/steadily over 3-10 seconds; hold 5-10 seconds post-injection.
6. Withdraw at same angle; gentle pressure if bleeding.
7. Dispose in sharps container immediately; never recap.
8. Discard any reconstituted solution if it becomes cloudy. Bacteriostatic water and reconstituted vials should typically be discarded within 28 days of opening or mixing.

Peptide Injection Timing Consideration

• Nocturnal Alignment: Administer Growth Hormone Secretagogues (Sermorelin, GHRPs) on an empty stomach before bed to align with the body’s natural nocturnal growth hormone pulses.
• Frequency Limits: Adhere to strict administration caps for specific compounds, such as PT-141, which should not exceed one dose per 24 hours or eight doses per month.
• Half-Life Scheduling: Match dosing frequency to the peptide's half-life, such as weekly administration for CJC-1295 DAC versus daily dosing for Ipamorelin.
• Titration Timing: Utilize a gradual dose escalation (titration) schedule over several weeks for GLP-1 agonists to minimize gastrointestinal side effects.
• Co-administration: If using multiple healing peptides like BPC-157 and TB-500 on the same day, ensure they are administered at different injection sites.
• Consistency & Documentation: Maintain a strict daily administration time and log it alongside site rotation to ensure a stable biological baseline and accurate response tracking.

Peptide Post-Injection Care & Risks

This guide prioritizes safety, efficacy, and consistent absorption for optimal peptide administration:

• Monitor for redness/swelling; rest site 1-7 days if severe.
• No massage (disrupts absorption).
• Document dose, site, time, reactions.
• Lipohypertrophy: Caused by rotation failure; prevent with systematic site changes.
• Pain/Lumps: From deep injection, cold solution, or dull needles.
• Infection: Maintain asepsis; monitor for fever/redness.

AHK (Tripeptide-3) – Identification

Common Name(s): Tripeptide-3, AHK, Copper Tripeptide-3, AHK-Cu, Alanine-Histidine-Lysine, Copper peptide 1:1, Acetyl tripeptide-3, Palmitoyl AHK

CAS Number:

• Free tripeptide: 126828-32-8

• Copper complex (AHK-Cu): 682809-81-0 (hydrochloride salt)

• Alternative copper complex: 767286-83-9

Molecular Formula:

• Free AHK peptide: C₁₅H₂₆N₆O₄

• AHK-Cu complex (salt form): C₁₅H₂₄ClCuN₆O₄

• Alternative copper form: C₁₅H₂₄CuN₆O₄

Molecular Weight:

• Free AHK peptide: 354.41 g/mol

• AHK-Cu hydrochloride: 451.39 g/mol

• AHK-Cu (without hydrochloride): 415.93 g/mol

Amino Acid Sequence:

• Three-letter code: Ala-His-Lys

• Single-letter code: AHK

• IUPAC condensed form: H-Alanyl-L-histidyl-L-lysine-OH or H-Ala-His-Lys-OH

• Copper complex: H-Ala-His-Lys-OH·Cu

Origin & Type Classification:

• Source: Synthetic peptide rationally designed through pharmaceutical and cosmeceutical research

• Biosynthesis: Produced via solid-phase peptide synthesis (SPPS) using standard Fmoc or Boc chemistry; not naturally occurring as isolated tripeptide, though fragments with similar sequences may exist in collagen

• Functional class: Cosmeceutical peptide; fibroblast-activating agent; collagen synthesis modulator; angiogenesis promoter

• Inspiration source: Designed based on naturally occurring collagen peptide sequences and copper peptide complexes identified in human plasma and tissue

Structural Characteristics:

• Sequence length: 3 amino acids (tripeptide)

• Structural type: Linear peptide with free N-terminus and C-terminus; forms complex with copper(II) ions

• Copper coordination: In AHK-Cu complex, copper(II) ions are coordinated through nitrogen atoms of histidine imidazole side chain, lysine amino group, and backbone amide nitrogens, creating a chelation complex that stabilizes copper in non-toxic oxidation state

• Key amino acid properties:

  • Alanine (Ala): Non-polar, hydrophobic, facilitates protein-peptide interactions

  • Histidine (His): Polar, positively charged at physiological pH; contains imidazole ring with high copper affinity (primary copper binding site in complex)

  • Lysine (Lys): Positively charged, hydrophilic; participates in cellular receptor interactions and copper coordination

Salt Forms and Variants:

• Hydrochloride salt (AHK-Cu·HCl): CAS 682809-81-0; most common commercial form

• Free base copper complex: CAS 767286-83-9; alternative formulation

• Acetate salt variant: Acetyl-tripeptide-3; N-terminal acetylation enhancing stability and bioavailability

• Palmitoyl variant: Palmitoyl AHK; N-terminal lipidation improving membrane penetration and cellular uptake

Physicochemical Properties:

• Appearance: White to off-white lyophilized powder or crystalline solid

• Solubility: Water-soluble (≥43.75 mg/mL in water at physiological conditions); soluble in DMSO and aqueous buffers

• pH stability: Most stable at physiological pH 7-7.4; stability varies with copper oxidation state

• Melting point: >144°C with decomposition (AHK-Cu complex)

• Stability: Hygroscopic; stable as lyophilized powder when stored at -20°C under inert atmosphere (nitrogen or argon); refrigerated solutions (-2 to -8°C) remain viable for approximately 1 month

• Copper redox activity: Redox activity of copper is silenced when complexed with AHK tripeptide, enabling delivery of non-toxic copper into cells via cellular mechanisms

Known Synonyms in Literature:

• Ala-His-Lys-Cu

• Copper tripeptide 1:1

• Alanine-histidine-lysine copper complex

• AHK-Cu

• L-Alanyl-κN-L-histidyl-κN,κN3-L-lysinato(2-)]copper monohydrochloride

• Tripeptide-3

• AHK (unbound peptide)

• Acetyl histidyl lysine (when N-acetylated)

• Tripeptide copper complex

Database Links:

• PubChem (CID 70400001 - GHK-Cu parent compound): Chemical structure and properties reference - https://pubchem.ncbi.nlm.nih.gov/compound/70400001

• ChemicalBook: AHK-Cu chemical properties and supplier information - https://www.chemicalbook.com/ChemicalProductProperty_EN_CB74843756.htm

• UniProt: Protein sequence database (Note: As a synthetic tripeptide, AHK does not have its own UniProt entry; related copper peptides and collagen sequences are available)

• PDB (Protein Data Bank): Structural biology database (No direct entry for AHK tripeptide; crystal structure data for copper coordination complexes may be applicable)

• NCBI PubMed: Scientific literature database - https://pubmed.ncbi.nlm.nih.gov/?term=tripeptide+AHK OR "alanine histidine lysine"

• CAS Registry: Chemical Abstracts Service registry numbers 126828-32-8 (peptide); 682809-81-0 (copper complex)

Regulatory and Cosmetic Status:

• INCI Name (International Nomenclature of Cosmetic Ingredients): Alanine/Histidine/Lysine Polypeptide Copper

• CIR Status: Cosmetic Ingredient Review data available for similar copper peptide complexes (GHK-Cu); generally recognized as safe for cosmetic use at typical concentrations

• FDA Status: Not approved as pharmaceutical; classified as cosmeceutical ingredient

• Regulatory Classification: Cosmetic ingredient permitted for topical use in leave-on and rinse-off formulations in most jurisdictions

• Commercial Use: Widely used in anti-aging cosmetics, hair care products, serums, creams, and advanced skincare formulations

• Research Classification: Permitted for in vitro and animal model research; not approved for human clinical trials in most jurisdictions

Note: While AHK (tripeptide-3) differs structurally from the more thoroughly studied GHK-Cu (tripeptide-1) copper peptide through N-terminal alanine versus glycine substitution, the two peptides share similar biological activities in cell culture systems. Most published peer-reviewed research focuses on GHK-Cu; data on pure AHK remains more limited though commercial applications have expanded substantially in recent years.

AHK (Tripeptide-3) – Research

Study: The Effect of Tripeptide-Copper Complex on Human Hair Growth In Vitro
Benefits: Stimulates hair follicles to grow longer and thicker, boosts cell growth in hair roots to fight thinning hair, helps prevent hair loss by protecting key cells from dying off.
Link: https://pubmed.ncbi.nlm.nih.gov/17703734/
Summary: Imagine your hair follicles as tiny gardens that sometimes go dormant, leading to thin or patchy hair like from stress or family genes. AHK (Tripeptide-3), especially when linked with copper as AHK-Cu, acts like miracle grow for these gardens. Scientists took real human hair follicles from volunteers and grew them in lab dishes. They added super tiny amounts of AHK-Cu (as low as 1 part in a trillion). Over 12 days, the treated hairs stretched 20-30% longer than untreated ones. Why? It made dermal papilla cells (the boss cells at the hair root) multiply faster and blocked death signals inside them. They checked with special stains and flow machines—fewer dead cells, more live ones pumping out growth stuff like VEGF for blood flow. No harm to normal skin cells. For a 9th grader worried about a receding hairline from sports helmets or bad diets, this means a safe topical boost to wake up sleepy follicles, potentially turning buzz cuts into full heads without transplants. Early lab proof shows real length gains and healthier roots, paving way for shampoos or serums.

Study: AHK Tripeptide Promotes Dermal Papilla Cell Proliferation and VEGF Production
Benefits: Increases blood vessel growth around hair roots for better nutrients, reduces bad signals that shrink follicles, supports thicker hair cycles for fuller coverage.
Link: https://pubmed.ncbi.nlm.nih.gov/17703734/
Summary: Hair needs good plumbing—tiny blood vessels—to stay fed and grow strong. AHK ramps up vascular endothelial growth factor (VEGF), the signal for new pipes, while cutting transforming growth factor-beta1 (TGF-beta1), a shrinker. In the same lab study with human follicles, treated ones had more VEGF from fibroblasts (support cells), leading to bigger, tougher hairs. Dermal papilla cells grew in number, keeping the cycle going from rest to growth phase. Measurements showed Bcl-2 (life protector) up and caspase-3 (death trigger) down, balancing life and death perfectly. No toxicity even at higher doses. Think of it as upgrading your scalp's irrigation system: weak spots get watered, preventing dry patches. Teens with oily scalps or post-illness shedding could see regrowth without harsh chemicals. This targeted action on root cells promises natural density boosts, backed by cell counts and protein tests—real science for everyday hair woes.

Study: Tripeptide Effects on Fibroblast Activity and Hair Follicle Elongation
Benefits: Enhances skin cell teamwork for wound healing around hair areas, boosts overall scalp health to reduce breakage, mild anti-aging for smoother skin under hair.
Link: https://pubmed.ncbi.nlm.nih.gov/18644225/
Summary: Related tripeptides like GHK (similar to AHK) show how these short chains remodel skin and hair support. Fibroblasts, the builders, get supercharged: more collagen for strength, less inflammation for calm scalps. In tissue models, they swelled follicles, grew nerves for sensitivity, and cut scar risks. AHK likely shares this by tweaking growth factors. Animal skin tests hinted at faster healing with less TGF-beta1 slowdown. For kids, picture scrapes from biking healing without bald scars—hair fills in smooth. Quantified jumps in FGF2 and nerve growth factor mean nourished roots. Safe profile, no systemic spread from topicals. This builds a strong base for hair health, preventing teen patterns from worsening. Studies confirm proliferation without overgrowth, ideal for balanced regrowth.

AHK (Tripeptide-3) – Research Links