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LL-37 vs Thymalin
LL-37 and Thymalin are both immune peptides, which is why they get recommended interchangeably — but they are different compounds with different origins. The table below sets out the differences. We give no dosing guidance.
Side by side, in plain English — what each one is, where they overlap and where they genuinely differ.
LL-37Immune
ThymalinImmuneAt a glance
| LL-37 | Thymalin | |
|---|---|---|
| Category | Immune | Immune |
| Typical route | SubQ | IM (or SubQ) |
| Shelf life once mixed | ~30 days | ~30 days |
The differences that actually matter
Both are classed as Immune peptides, so they get compared constantly and are often researched for overlapping reasons.
Route of administration differs — LL-37 is typically subq, Thymalin is typically im (or subq). That alone changes how convenient each one is to keep up with.
What LL-37 is
LL-37 is a human cathelicidin antimicrobial peptide, a component of the innate immune system. Its mechanism of action involves direct disruption of microbial membranes, providing broad-spectrum antibacterial and antiviral activity. Beyond this direct action, LL-37 acts as a signaling molecule, interacting with various cellular receptors, including G-protein coupled receptors like FPR2, to modulate immune responses. Biochemically, LL-37 is an amphipathic alpha-helical peptide, allowing it to insert into and destabil
What Thymalin is
Thymalin is a synthetic analogue of a complex of peptides naturally found in the thymus gland. It is understood to influence the differentiation and maturation of T-lymphocytes, particularly pre-T cells, within the immune system. It is important to remember that Thymalin is an investigational compound intended solely for research purposes and is not for human consumption or therapeutic use; it should not be considered medical advice.
How to compare them for yourself
Anecdotes online are noisy because nobody is measuring the same thing. The only comparison that means anything is your own: log each entry with a timestamp, keep the vial ledger honest so you know what you actually got through, pick two or three metrics before you start, and look at the trend after several weeks rather than day to day.
Peptide Wizard does that part for you — LL-37 and Thymalin are both in the built-in reference library with a 3D vial, and your history, vial ledger and cost per entry stay private on your device.
FAQ
What is the difference between LL-37 and Thymalin?
Both are classed as Immune peptides, so they get compared constantly and are often researched for overlapping reasons.
Can you log LL-37 and Thymalin in the same period?
Plenty of people record more than one peptide at a time. Peptide Wizard keeps a separate vial ledger and entry history for each, so you can see exactly what overlapped and when — it does not recommend combinations or doses.
Which is better, LL-37 or Thymalin?
There isn't a universal answer — reported responses vary a lot between individuals, which is why your own log is more informative than anyone else's anecdote. Track one variable at a time and compare your own metrics over several weeks.
Is this medical advice?
No. This page is educational reference material only. It contains no dosing guidance. Speak to a qualified healthcare professional before making any decisions.
Handling questions
Whichever you pick, mixing and storage work the same way. Search the guides and land straight on the answer.
Can I shake it? · It went cloudy · Should I filter? · Fridge or freezer?
See all peptide comparisons →
Educational reference only. This page contains no dosing guidance and is not medical advice.