AHK-Cu (Alanine-Histidine-Lysine Copper) vs Thymalin
A neutral, side-by-side comparison of two anti-aging & longevity peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
AHK-Cu (Alanine-Histidine-Lysine Copper)
Copper-chelating tripeptide structurally related to GHK-Cu but optimized for scalp and hair follicle applications. AHK-Cu activates hair follicle stem cells and prolongs the anagen (active growth) phase, making it a key research compound for androgenetic alopecia and diffuse hair loss. Used topically as an alternative or complement to minoxidil and finasteride.
Full profileThymalin
Thymus-derived peptide bioregulator developed in Russia containing a mixture of low-molecular-weight peptides extracted from calf thymus. Primarily studied for reversing immunological aging (immunosenescence) and extending healthy lifespan. Vladimir Khavinson's longitudinal research on elderly patients links thymalin administration to significant improvements in immune markers and all-cause mortality reduction.
Full profile| AHK-Cu (Alanine-Histidine-Lysine Copper) | Thymalin | |
|---|---|---|
| Category | Anti-Aging & Longevity | Anti-Aging & Longevity |
| Also known as | AHK copper peptide, Ala-His-Lys copper, hair growth copper peptide, AHK-copper complex | thymic peptide bioregulator, T-activin extract, thymus peptide, thymic bioregulator |
| Evidence | Research-stage | Research-stage |
| Dosing range | 0.1%–1% %, Daily topical application (scalp) | 5mg–20mg mg, 5–10 day course, 1–2x per year |
| Administration | Topical (scalp serum/solution), Subcutaneous (microneedling-assisted delivery) | Intramuscular injection, Subcutaneous injection |
| Key side effects | Mild scalp irritation, Contact dermatitis (rare), Temporary scalp redness or tingling, Transient scalp shedding at initiation (shedding phase) | Injection site reactions, Mild fever (rare), Temporary increase in immune activity (desired response), Rare hypersensitivity |
| Cited sources | 2 references | 2 references |
Key differences
- Administration: AHK-Cu (Alanine-Histidine-Lysine Copper) — Topical (scalp serum/solution), Subcutaneous (microneedling-assisted delivery); Thymalin — Intramuscular injection, Subcutaneous injection.
- Dosing units differ: AHK-Cu (Alanine-Histidine-Lysine Copper) is dosed in %, Thymalin in mg — they operate at different scales.
- Frequency: AHK-Cu (Alanine-Histidine-Lysine Copper) is typically Daily topical application (scalp); Thymalin is 5–10 day course, 1–2x per year.
How each works
AHK-Cu (Alanine-Histidine-Lysine Copper)
AHK-Cu activates β-catenin/Wnt signaling in dermal papilla cells and promotes VEGF expression around hair follicles. Studies demonstrate extended anagen phase duration, increased follicle size, and upregulation of hair growth factors in treated scalp tissue. The copper component supports tyrosinase activity for follicle pigmentation and metalloenzymes involved in extracellular matrix remodeling around follicles.
Thymalin
Thymalin contains multiple bioactive peptides that stimulate T-lymphocyte differentiation and restore thymic function that declines with age. In Khavinson's 6-year controlled trial of elderly patients (78–89 years), annual thymalin courses were associated with significantly lower mortality and improved immune parameters vs. controls. Proposed mechanisms include telomerase activation in immune cells and restoration of thymic epithelial cell function.
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.