“I noticed I felt more up for my usual routine after starting Thymalin.”

Thymalin (Injectable)
Thymic peptide
All-in monthly price
No membership fee · this is the full price · free shipping · avg 4-week supply
Add in-depth bloodwork
Optional — add a physician-reviewed at-home blood panel to your plan.
Your sex-hormone baseline plus the safety markers that matter on therapy — blood counts, liver and kidney function — from one painless upper-arm device. Matched to your sex (PSA for men; progesterone & FSH for women). No needle, no clinic, physician-reviewed.
This treatment requires licensed provider review and approval. Treatment is not guaranteed. If prescribed, medication is fulfilled by a licensed U.S. pharmacy where permitted by law. Compounded medications are not FDA-approved or FDA-cleared.

Reviewed by Dr. Gene, MD · Board-certified Family Medicine
Every Pepti prescription is reviewed by a licensed U.S. physician before it's dispensed — and only provided if clinically appropriate.
FDA status: Compounded medication, not FDA-approved. No FDA-approved drug contains it. Status of every medication
What patients say about Thymalin
“I had enough energy to take my regular walk before dinner.”
“My mornings felt less sluggish even on busy weeks.”
“The difference was easiest to spot on days I had a lot to get done.”
Thymalin (Injectable)
Thymalin is a peptide taken from the thymus gland, the organ that trains the immune system's T-cells and shrinks with age. It is studied for restoring immune balance in older adults and for healthy aging. Compounded; not FDA-approved.
About a 4-week supply supply at the standard prescribed dose — your physician confirms exact dosing.
A licensed US physician reviews your intake and prescribes when appropriate.
Compounded fresh at a US pharmacy and shipped cold-chain to your door.
Every order ships free — medication, physician care and refills, one all-in price.
Amounts shown are per unit. Compounded fresh at a US FDA-registered pharmacy.
Every batch independently tested
Every medication batch dispensed through Pepti is independently tested by a qualified third-party laboratory for applicable quality and safety standards before the pharmacy releases it. Batches are tested to the same standard used by 503B outsourcing facilities.
Confirms the finished preparation is free of viable microorganisms.
Screens for endotoxins that can cause fever or inflammatory reactions.
Verifies the labeled concentration of the active peptide is what is in the vial.
- Lot 110226-THL-1
Tested 2026-11-04 · Biolink Life Sciences Carolinas
Sterility
Sterile
Endotoxin
<2 EU/mL
Potency
99.2%
- Lot 102626-THL-1
Tested 2026-10-28 · Biolink Life Sciences Carolinas
Sterility
Sterile
Endotoxin
<2 EU/mL
Potency
99.2%
- Lot 101926-THL-1
Tested 2026-10-21 · Biolink Life Sciences Carolinas
Sterility
Sterile
Endotoxin
<2 EU/mL
Potency
99.7%
How Thymalin is prescribed.
- Adults over 50 who get sick more often than they used to
- People who want to support immune balance as part of a longevity protocol
- Patients recovering slowly from illness whose physician is managing them
- Anyone who prefers a natural thymus peptide over a synthetic immune drug
Your physician decides whether Thymalin is appropriate for you after reviewing your intake and labs.
Inject 0.25 mL (25 units) subcutaneously once daily Monday through Friday.
- Licensed physician review of your intake, history, and labs
- Medication compounded to your prescription by a PCAB-accredited, FDA-registered pharmacy
- Every batch independently tested before release
- Sterile syringes and alcohol prep pads for injectables
- Tracked delivery to your door, refills on schedule
- Message your physician anytime; dose changes without an appointment
- Store refrigerated (36–46°F / 2–8°C) at all times, including before first use.
- One vial is your monthly supply. A fresh vial ships every 28 days on your refill schedule, so you're always well inside the beyond-use date on your label.
- Protect from light. Wipe the stopper with an alcohol pad before every draw.
- Dispose of syringes in the sharps container per the included instructions.
A typical course of Thymalin.
Everything published
about Thymalin.
How it is described to work, pathway by pathway. What the research shows and what it does not. Where it stands with the FDA, dated and sourced.
Read the referencepeer-reviewed, each verified on PubMed
mechanism, evidence, dosing, safety, FAQ
2026 · checked against fda.gov, not memory
How Thymalin works, and what the research shows.
The thymus gland trains T-cells, the immune cells that recognize infections, and it shrinks steadily after our twenties.
Thymalin supplies the thymus's own peptides and is studied for restoring the signals that help T-cells mature and stay balanced.
A long-running Russian program reported fewer infections and better immune markers in older adults followed for years.
Khavinson and Morozov, 2003Western controlled trials have not been done.
References
- Khavinson VKh, Morozov VG. [Geroprotective effect of thymalin and epithalamin] · Adv Gerontol (2002) · PMID 12577695
- Khavinson VKh. Peptides and Ageing · Neuro Endocrinol Lett (2002) · PMID 12374906
- Khavinson VK, Linkova NS, Kvetnoy IM, Polyakova VO, Drobintseva AO, Kvetnaia TV, Ivko OM. Thymalin: Activation of Differentiation of Human Hematopoietic Stem Cells · Bull Exp Biol Med (2020) · PMID 33237528
- Khavinson VK, Kuznik BI, Trofimova SV, Volchkov VA, Rukavishnikova SA, Titova ON, Akhmedov TA, Trofimov AV, Potemkin VV, Magen E. Results and Prospects of Using Activator of Hematopoietic Stem Cell Differentiation in Complex Therapy for Patients with COVID-19 · Stem Cell Rev Rep (2021) · PMID 33575961
- Kuznik BI, Shapovalov KG, Smolyakov YN, Lukyanov SA, Tereshkov PP, Kazantseva LS, Linkova NS. [Morphological compound and indicators of the blood clotting system in severe COVID-19 patients of middle aged and elderly during treatment of Tocilizumab and Thymalin] · Adv Gerontol (2022) · PMID 36169363
- Avolio F, Martinotti S, Khavinson VK, Esposito JE, Giambuzzi G, Marino A, Mironova E, Pulcini R, Robuffo I, Bologna G, Simeone P, Lanuti P, Guarnieri S, Trofimova S, Procopio AD, Toniato E. Peptides Regulating Proliferative Activity and Inflammatory Pathways in the Monocyte/Macrophage THP-1 Cell Line · Int J Mol Sci (2022) · PMID 35408963
- Linkova N, Khavinson V, Diatlova A, Petukhov M, Vladimirova E, Sukhareva M, Ilina A. The Influence of KE and EW Dipeptides in the Composition of the Thymalin Drug on Gene Expression and Protein Synthesis Involved in the Pathogenesis of COVID-19 · Int J Mol Sci (2023) · PMID 37686182
Citations are provided for educational purposes. They do not constitute medical advice. Always discuss any peptide protocol with your prescribing physician.
Important safety information
+
Possible side effects
Do not use if you have
If you experience severe side effects, call 911 or go to your nearest emergency room.
vial — Thymalin 5mg/5mL 1mg/mL (5mL)
Frequently asked
about Thymalin (Injectable).
Thymalin is a peptide taken from the thymus gland, the organ that trains the immune system's T-cells and shrinks with age. It is studied for restoring immune balance in older adults and for healthy aging. Compounded; not FDA-approved. Thymalin is prescription-only at Pepti: a licensed physician reviews your assessment and, if appropriate, prescribes it to be compounded by a state-licensed, FDA-registered pharmacy.
Thymalin is $209 per month at Pepti. That is all-in: medication, physician review and ongoing care, shipping, and messaging. No membership, consult, or visit fees, and the price is the same in every state.
Thymalin is commonly prescribed for: Adults over 50 who get sick more often than they used to; People who want to support immune balance as part of a longevity protocol; Patients recovering slowly from illness whose physician is managing them; Anyone who prefers a natural thymus peptide over a synthetic immune drug. Whether it is appropriate for you is decided by the reviewing physician from your history, medications, and labs where required.
Yes. Thymalin is prescription-only. The free online assessment takes about five minutes, a physician licensed in your state reviews it within 4 hours, and if approved the prescription goes to the pharmacy. If not approved, the medication charge is refunded.
No. Thymalin can be prescribed from the assessment alone. If your physician wants labs for your care, they'll ask through your account; upload a recent lab report from any lab at no charge, or order Pepti's at-home panel.
Thymalin is a subcutaneous injection into the abdomen or thigh with a small insulin syringe. Your kit ships with sterile syringes and alcohol prep pads, and the exact dose and schedule are printed on the pharmacy label. Dosing videos are in your account.
33 more questions about Pepti, answered.Show fewer
One vial is your monthly supply at the dose your physician prescribes. A fresh vial ships about every 28 days, and the date moves if your physician changes your dose. Store it as the pharmacy label directs, refrigerated.
Once per fill, $209 each time, when the next vial ships. It renews until you cancel, which you can do anytime from your account with no cancellation fee.
The compounded Thymalin with sterile syringes and alcohol prep pads, free tracked shipping in an unbranded box with insulated packaging, the physician review, ongoing physician care and dose adjustments, and unlimited messaging.
Reported side effects of Thymalin are usually mild: mild redness or swelling at injection site; temporary fatigue or headache; mild nausea (uncommon). The physician screens your history, medications, and allergies before prescribing, the medication-specific consent lists the known risks, and you can message your physician about anything you notice. Seek emergency care for severe symptoms.
Response varies by person, goal, and dose, and Thymalin is prescribed for ongoing use rather than a short trial. Your physician sets expectations at approval, tracks how you respond through your account, and adjusts the dose without an appointment.
Yes. Request it from your account or the app; your physician approves or declines. If approved you pay for the additional medication at the pharmacy's cost and the new dose applies to your next shipment.
Yes. Add Thymalin to a plan with another treatment and both go through one assessment and one physician review, shipping together on one schedule. Each keeps its own catalog price. The physician reviews the combination and can adjust it.
No. Compounded Thymalin is not FDA-approved. It is prepared to your physician's prescription by a state-licensed, FDA-registered 503A pharmacy and every batch is independently tested before release.
Yes, when prescribed by a licensed physician and dispensed by a licensed pharmacy, which is how Pepti provides it in every state it serves. Research-use-only Thymalin sold without a prescription is labeled not for human use and is a different product.
The thymus gland trains T-cells, the immune cells that recognize infections, and it shrinks steadily after our twenties. At Pepti it is prescribed to support supports immune balance, studied in older adults, helps the body train its t-cells, daily injection, monday to friday. Individual response varies, and your physician sets expectations at approval.
The thymus gland trains T-cells, the immune cells that recognize infections, and it shrinks steadily after our twenties. Thymalin supplies the thymus's own peptides and is studied for restoring the signals that help T-cells mature and stay balanced. Compounded Thymalin is not FDA-approved; it is prescribed off-label by a licensed physician after reviewing your assessment.
Thymalin is prescribed for supports immune balance, studied in older adults, helps the body train its t-cells, daily injection, monday to friday. It is commonly requested by adults over 50 who get sick more often than they used to; people who want to support immune balance as part of a longevity protocol; patients recovering slowly from illness whose physician is managing them; Anyone who prefers a natural thymus peptide over a synthetic immune drug. Whether it is appropriate for you is the reviewing physician's decision.
Thymalin is studied for supports immune balance, studied in older adults, helps the body train its t-cells, daily injection, monday to friday. Those are the goals it is prescribed to support at Pepti; results vary by person, dose, and consistency, and no outcome is guaranteed. Your physician tracks how you respond through your account.
A long-running Russian program (Khavinson and Morozov, 2003) reported fewer infections and better immune markers in older adults followed for years. Western controlled trials have not been done. References are listed on this page.
Thymalin is generally not prescribed with: active cancer or history of cancer (unless approved by oncologist); pregnancy or breastfeeding; severe kidney or liver disease; known allergy to the peptide or excipients. The physician screens for these in your intake, and anything that rules Thymalin out means it is not prescribed and is refunded.
At Pepti. Complete the free assessment, a physician licensed in your state reviews it within 4 hours, and if appropriate Thymalin is compounded by a state-licensed, FDA-registered pharmacy and shipped free to your door for $209 per month, all-in. Not prescribed means refunded.
Injectable vial: 5 mL at 1 mg/mL, containing 5 mg Thymalin. One vial is your monthly supply at the prescribed dose, and a fresh one ships about every 28 days.
Not currently. Thymalin ships as a multi-dose vial with sterile syringes and prep pads. The pepti Pen is available for 24 other treatments.
$209 per month covers the compounded Thymalin, the physician review, ongoing physician care including dose adjustments and refill review, unlimited messaging, and free tracked shipping. There is no membership, consult, visit, or refill fee; the only separate charges are optional at-home lab panels and a physician-approved dose increase billed at pharmacy cost.
Yes. Thymalin is on Pepti's live catalog, which lists only treatments a partner pharmacy can compound and ship today. If a physician prescribes it, it ships; if it ever cannot be dispensed, the charge is refunded.
Thymalin ships to 49 states and Washington, D.C, free and tracked, in insulated unbranded packaging. Eligibility is confirmed during the assessment from your shipping address.
$209 per month at Pepti. That includes the compounded Thymalin, the physician review and ongoing care, free tracked shipping, and messaging, with no membership, consult, or visit fee. The price is the same in every state and every refill is the same price.
Pepti supplies Thymalin as a monthly injectable vial with syringes and prep pads included, one vial per month at $209, prescribed by a licensed physician after a free online assessment and shipped free from a state-licensed, FDA-registered pharmacy in insulated packaging.
Yes. Pepti prescribes Thymalin online in 49 states and Washington, D.C after a free assessment reviewed by a physician licensed in your state. It is compounded by an FDA-registered pharmacy and shipped free, $209 per month all-in. Not prescribed means refunded.
Yes. At Pepti the entire process is telehealth: a five-minute online assessment, physician review within 4 hours, then Thymalin ships from the pharmacy. No clinic visit and no video appointment in most cases. $209 per month, all-in.
Yes, for the real thing. Thymalin sold without a prescription is research-use-only product labeled not for human use, with no physician, no pharmacy, and no verified testing. Pepti's Thymalin is physician-prescribed, pharmacy-compounded, batch-tested, and $209 per month including the physician and shipping.
Pepti does, in 49 states and Washington, D.C, with named board-certified physicians, a state-licensed FDA-registered compounding pharmacy, independent batch testing, and one published all-in price of $209 per month with no membership or consult fee. Refunded if the physician does not prescribe.
It is legal to be prescribed Thymalin online by a licensed physician and have it dispensed by a licensed pharmacy, which is how Pepti provides it. Buying it as a research chemical without a prescription is a different product and is not for human use. Compounded Thymalin is not FDA-approved.
$209 per month at Pepti, including the medication, the physician, and shipping. Refills are the same price and there is no membership fee.
Yes. Pepti has no clinics: the assessment, physician review, messaging, dose changes, and refills all happen online, and Thymalin ships free from the pharmacy to your door in 49 states and Washington, D.C.
Start the free assessment at hellopepti.com, choose Thymalin, and answer the health questions. A physician licensed in your state reviews it within 4 hours. If approved, Thymalin ships the next business day and arrives overnight; if not, the $209 is refunded.
No. Thymalin can be prescribed from the assessment alone at Pepti. If your physician wants labs for your care, they'll ask through your account; upload a lab report from any lab, or order a Pepti at-home panel from $129.
Pepti ships Thymalin to 49 states and Washington, D.C, free and tracked, refrigerated in insulated packaging, directly from the pharmacy. It ships the next business day and arrives overnight.
Questions people ask
about Thymalin (Injectable).
- Thymalin: What It Is, Where to Get It Prescribed, and What It CostsThymalin — vial — Thymalin 5mg/5mL 1mg/mL (5mL). Specification, mechanism, dosing, formats, state availability and how to get it prescribed.
- Thymalin Dosage: How Pepti Prescribes It, in Units, mL and mgThe thymalin dosage Pepti prescribes: 0.25 mL (25 units on a U-100 insulin syringe) under the skin once daily Monday through Friday, 0.25 mg per dose, 20 doses per vial. Includes a units to mL to mg chart for the 1 mg/mL vial, how long a vial lasts, why the Russian studies give no dose to copy, side effects and how to get it prescribed.
- Thymalin Side Effects: What Is Reported, the Allergy Question, and What to ReportA practical reference to thymalin side effects: injection-site redness, soreness, bruising and itching, why an extract of animal origin carries a theoretical allergy risk, the immune questions raised at intake, why there are no percentages, what needs emergency care, and who should discuss it first.
- Thymalin Benefits: What the Research Actually ShowsThe benefits claimed for thymalin, one at a time: T-cell maturation, inflammatory signalling, immune ageing, respiratory infections, longevity and hospital inflammation markers, with what kind of study sits behind each, how strong it is, how it differs from thymosin alpha-1, the side effects, FDA status and how Pepti supplies it.
- Can You Take Thymalin With Tirzepatide or Semaglutide?Thymalin and tirzepatide or semaglutide act on unrelated systems, and no study has tested them together. What each one does, what is and is not known about combining them, why new symptoms are more often the GLP-1, the allergy and immune questions raised at intake, how the schedules fit, and how to add thymalin properly.
- How Long Does Thymalin Take to Work? What the Studies Measured, and Over What PeriodThymalin research runs on very different clocks: cell experiments, Russian hospital stays in COVID-19 patients, and an older-adult programme treated for two to three years and followed for six to eight. What each measured, why none gives a timeline for the injection, and how to judge thymalin on a 28-day vial.
- Do You Need a Prescription for Thymalin? Is It Legal to Buy Online?Thymalin needs a prescription for human use in the US. What the law says, why thymalin was never on the FDA's Category 2 list, how it differs from thymulin and thymosin alpha-1, and what research-use-only thymalin is.
- Best Place to Get Thymalin Online: How to Choose a ProviderWhere to get Thymalin prescribed online, the six things to check before you order from anyone, why a thymus extract raises its own sourcing questions, and exactly what Pepti's Thymalin prescription includes.
- Thymalin for Women: What the Research Has Looked At, and What to Raise FirstWhat research has actually studied about thymalin in women: no study reports separate findings by sex, the human work is Russian and uncontrolled, and thymalin is not used in pregnancy or breastfeeding. Why autoimmune history matters more for women, how it sits alongside menopause, side effects, and how to get thymalin prescribed.
- Thymalin for Men: What the Research Has Looked At, and What It Has NotWhat research has actually studied about thymalin in men: no study reports separate findings by sex, the human work is a Russian observational programme in older adults and two hospital reports, and thymalin is not a testosterone or hormone product. Plus the considerations that come up for men, sport testing, and how to get thymalin prescribed.
- Is Thymalin Banned in Sports? WADA Status, S0 and Drug TestsThymalin is not named on the WADA Prohibited List, but the S0 class for non-approved substances and WADA's warning about unnamed peptides mean a tested athlete should not assume it is allowed. What that means in practice, what a workplace drug test looks for, and where thymalin stands with the FDA.
- Peptides for Immune Support: Thymosin Alpha-1, FORTIFY and the EvidenceWhat thymic peptides actually do to immune signalling, which ones have real clinical evidence behind them, what they cost, and who should not take an immune modulator.
- How Much Do Peptides Cost? Real Monthly Prices and What Drives ThemWhat prescription peptides actually cost per month, why single molecules price differently from four-peptide blends, which costs providers hide behind a low headline, and how to compare.
- Do You Need a Doctor to Get Peptides? Yes, and Here Is Exactly WhyPeptides used clinically are prescription medications. Why a prescriber is legally required, what your own doctor will likely say, and what a real review looks like online.
- Where to Get Peptides for Immune Support Online: How to Choose a PrescriberThymosin alpha-1, thymalin, KPV and FORTIFY are prescription-only. Where to get immune peptides online legitimately, what a careful provider screens for first, what each option costs at Pepti, and where each molecule stands with the FDA.
- How to get Thymalin prescribed online
- How Much Does Thymalin Cost?Thymalin cost in 2026: $209 per month all-in at Pepti — compounded medication, physician review, and shipping included. No membership or consult fees.
Read more about Thymalin (Injectable).
Do You Need a Prescription for Thymalin? Is It Legal to Buy Online?
Thymalin needs a prescription for human use in the US. What the law says, why thymalin was never on the FDA's Category 2 list, how it differs from thymulin and thymosin alpha-1, and what research-use-only thymalin is.
Best Place to Get Thymalin Online: How to Choose a Provider
Where to get Thymalin prescribed online, the six things to check before you order from anyone, why a thymus extract raises its own sourcing questions, and exactly what Pepti's Thymalin prescription includes.
Thymalin: What It Is, Where to Get It Prescribed, and What It Costs
Thymalin — vial — Thymalin 5mg/5mL 1mg/mL (5mL). Specification, mechanism, dosing, formats, state availability and how to get it prescribed.
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