Thymalin — Complete Dosing Protocol & Guide

Thymalin is a immune support peptide — the immune support category covers immune modulation, thymus function, resilience. Thymus peptide bioregulator (polypeptide complex from thymus tissue) that restores T-cell production and immune competence — the classic Russian immune-restoration course. In research settings it is administered subcutaneous or intramuscular at a frequency of once daily (10-day course), with an elimination half-life of ~minutes to hours and a studied dose range of 500 mcg–1 mg per administration (about 7.5 mcg/kg of body weight).

Thymus peptide bioregulator (polypeptide complex from thymus tissue) that restores T-cell production and immune competence — the classic Russian immune-restoration course. That mechanism places it in the immune support category. Pharmacokinetically, its elimination half-life of ~minutes to hours is what shapes the once daily (10-day course) dosing cadence used in research protocols, and the full effect builds across a 10 days cycle followed by 6-12 months off — which is why the dosing is cycled rather than continuous.

Thymalin is taken subcutaneous or intramuscular — subcutaneous injection into abdominal fat is the standard research route. The research-standard frequency is once daily (10-day course), with a half-life of ~minutes to hours. Keep administrations evenly spaced across the dosing period so plasma levels stay steady. Always start at the low end of the dose range, use aseptic technique for injections, and follow the 10 days cycle followed by 6-12 months off. PeptideWise calculates the exact dose and schedule for your body weight and goal.

Research protocols use 500 mcg–1 mg per administration, weight-based at roughly 7.5 mcg/kg of body weight, administered once daily (10-day course). For an 80 kg (176 lb) adult that works out to about 420 mcg for a beginner, 510 mcg for an intermediate, and 600 mcg for an advanced research protocol. Start at the bottom of the range and titrate up only while the response is tolerable — the personalized protocol engine on this site computes the exact figure for your weight.

The standard research cycle is 10 days, followed by 6-12 months off. Cycling matters because continuous exposure leads to receptor desensitization (tachyphylaxis) — the same dose produces less effect over time — and side effects fade during off periods. Don't extend the cycle past 10 days chasing diminishing returns.

Yes. Thymalin is commonly researched alongside Thymosin Alpha 1, Epithalon (Epitalon). The best stacks pair peptides that act through different mechanisms toward the same goal — for example BPC-157 (angiogenesis) with TB-500 (cell migration). Introduce one peptide at a time, align cycle lengths, and cap stacks at 2–3 peptides so effects stay attributable. The protocol engine on this site only recommends stack combinations that pass safety screening for your conditions and medications.

Reported in research and trial settings: mild injection site reaction; rare allergic reaction. Most are dose-dependent and resolve when the dose is reduced or the cycle ends. If any severe reaction occurs (chest pain, severe abdominal pain, difficulty breathing, signs of an allergic response), stop immediately and seek medical evaluation.

Thymalin carries a good research safety profile at the doses described above, but safety is individual. It is contraindicated in research settings with: autoimmune, organ transplant, immunosuppressants, pregnant, breastfeeding. It is not medical advice to run any peptide without supervision — consult a qualified healthcare provider who knows your full history first, get baseline labs, and re-check during the cycle. 🛡️ As a immune support peptide, Thymalin is sold for research use only.

Thymalin is sold by research-chemical suppliers for laboratory research use only — it is not an approved dietary supplement or consumer product, and regulations vary by country and jurisdiction. Before considering any source: (1) consult a licensed healthcare provider about medically supervised options, (2) if purchasing for research, verify third-party certificates of analysis (COA) confirming purity and identity, and (3) be wary of prices that look too good to be true — they usually are. PeptideWise does not sell peptides; we provide dosing research and protocol tools.

Thymalin ships lyophilized (freeze-dried) and must be reconstituted before use. Use bacteriostatic water: inject it slowly down the inside wall of the vial (never directly onto the powder), then swirl gently — never shake, as shaking denatures the peptide. Example: a 5 mg vial + 2 mL of bacteriostatic water gives 2.5 mg/mL, so a 250 mcg dose is 10 units (0.1 mL) on an insulin syringe. Store the reconstituted vial refrigerated at 2–8°C and use within 2–4 weeks. See the full step-by-step reconstitution guide for concentration math and storage.