About
Quality peptides, made in the USA.
A research-first laboratory specializing in lyophilized peptides for cell-culture, in-vitro and academic research. HomeAbout
Our mission
At Limitless Biotech, our mission is to provide laboratories and independent researchers with the highest-quality reference peptides available anywhere. We believe quality control is not a marketing claim — it is a paper trail. Every lot we ship is backed by HPLC chromatograms and mass-spectrometry data we are willing to send you on request.
Where every vial is made
Synthesis happens entirely inside our United States facility. Solid-phase peptide synthesis (SPPS) is performed under controlled humidity and temperature, deprotection and cleavage are run with fresh reagent batches, and crude product is purified by multiple rounds of preparative reverse-phase HPLC. Once a lot meets the >99% purity threshold, the peptide is shell-frozen and lyophilized into a fluffy white cake, the standard format expected in research applications.
The QC pipeline behind every lot
Identity. Mass spectrometry confirms the molecular weight of the eluting peak matches the theoretical mass of the target sequence within tolerance. Purity. Analytical RP-HPLC integrates the area of the target peak versus all detectable impurities. We accept lots only above 99.0%. Endotoxin / appearance. Visual inspection of the lyophilized cake, color, and reconstitution clarity. Any lot that fails resolves into a clear, colorless solution is rejected. Lot release. A unique lot number is assigned and the COA is filed. Customers can request the COA at any time by quoting their order number.
>99% purityHPLC + MS verified
USA synthesizedLyophilized in-house
Cold-pack shippingInsulated mailers
COA on requestPer-lot reports
Custom synthesis
We synthesize any peptide sequence on request — from short tripeptides up to larger fragments around 50 residues. Send us the sequence, the quantity (typical 5 mg, 10 mg, 25 mg, 100 mg, 1 g) and the purity grade you need (95%, 98%, >99%) and our team will quote within one business day. NDA available on request for unpublished sequences. Learn more about custom & bulk synthesis →
What ships in every order
Lyophilized peptide vial(s), sealed under inert atmosphere Lot & batch identification on every vial label Cold-pack insulated mailer with gel pack(s) Plain, unbranded outer packaging — discreet, no exterior product reference USPS Priority tracking number, emailed at dispatch
Research use only
Every product on this site is sold strictly for in-vitro laboratory and research use. None of our peptides are intended for human consumption, clinical use, veterinary use, or therapeutic application. By placing an order you confirm you are a qualified researcher operating in compliance with all applicable local laws.
Have a sequence in mind?
Email our chemistry team for a custom-synthesis quote — typical turnaround is 1–3 weeks.
Contact our team