Teriparatide (PTH 1-34) Testing & Verification
Independent, third-party analysis of mail-in Teriparatide samples by RP-HPLC-UV — confirming what your vial actually contains, not what the label claims.
What Teriparatide is
Teriparatide is the biologically active N-terminal fragment of human parathyroid hormone — the first 34 amino acids of the 84-residue native hormone, and the portion responsible for its receptor activity. It is a linear, non-lipidated peptide of about 4,118 Da, originally developed as a pharmaceutical (Forteo/Forsteo) and long studied for its effects on bone remodeling. With the originator patents expired and biosimilars on the market, teriparatide has moved into the research-peptide space, where lyophilized vials — commonly labeled 10 mg — are sold with no regulated manufacturing or identity guarantee. A 34-residue synthesis is long enough to accumulate deletion and truncation byproducts, which is exactly the situation where independent verification of identity, purity, and actual content earns its keep.
Why get your Teriparatide independently tested
- Wrong-compound substitution: teriparatide is frequently confused — and sometimes deliberately swapped — with other bone-active or PTH-related peptides, including abaloparatide (a PTHrP analog, a different molecule). An identity check by retention time and UV spectrum against a certified teriparatide reference standard confirms which peptide is actually in the vial.
- Underfilling and short content: research-market teriparatide is typically sold in 10 mg vials at a significant price per milligram, which makes underfilling profitable. The net-peptide assay reports the milligrams actually present so you can compare measured content against the label.
- Label mass vs. true peptide mass: lyophilized vials carry counter-ion, salt, and excipient weight along with peptide. The net-peptide assay isolates the peptide content specifically, exposing the gap between labeled milligrams and real peptide milligrams.
- Synthesis-related impurities: a 34-residue linear sequence is prone to deletion sequences, truncations, and oxidation (teriparatide carries two methionines, at positions 8 and 18, that oxidize readily). Chromatographic purity as area percent quantifies the main peak against everything else the UV trace sees.
What we measure on Teriparatide
Every Teriparatide certificate reports exactly three results by reversed-phase HPLC with UV/diode-array detection at 214 nm: identity, established by matching your sample's retention time and UV spectrum to a certified teriparatide (PTH 1-34) reference standard; chromatographic purity, as the area percent of the main peak relative to total integrated peak area; and net-peptide assay — the milligrams of peptide measured per vial, reported against the label claim.
Every result is issued as a certificate of analysis you — or anyone you forward it to — can verify cryptographically. Reporting identity, purity, and milligram content is the point: a vial can be pure and still underfilled, so we report all three. More on purity vs. net-peptide content and how to read a peptide COA.
Our scope — stated plainly
Testing is RP-HPLC-UV against a certified reference standard. Identity is a retention-time and UV-spectral match, not a mass-spectrometry sequence confirmation. KMD Analytical is an independent laboratory; we do not perform sterility, endotoxin, heavy-metal, or residual-solvent testing.
KMD is an independent RP-HPLC-UV lab. We do not run LC-MS / mass-spec, sterility, endotoxin, or heavy-metal testing. If your job needs a capability we don't have, we'll say so.
Teriparatide testing — FAQ
Can you tell teriparatide apart from abaloparatide?
Yes. They are different molecules — teriparatide is the human PTH(1-34) fragment, while abaloparatide is an analog of PTH-related protein — and they separate with distinct retention times under our method. We confirm identity against a certified teriparatide reference standard, so a vial containing the wrong member of the family will not match.
My vial says 10 mg — will the certificate tell me what's really inside?
That is exactly what the net-peptide assay is for. It reports the milligrams of peptide we actually measure in your vial, printed next to the label claim on the certificate — measured number versus printed number, no interpretation required.
Does testing check whether the peptide is degraded?
Chromatographic purity captures UV-absorbing degradation: oxidized species (teriparatide's two methionines are the usual suspects), truncations, and other byproducts show up as additional peaks, which lower the reported area-percent purity of the main peak. What we report is how much of the material is the intact main peak versus everything else.
Other peptides we test
Retatrutide · Cagrilintide · Tesamorelin · BPC-157 · see the full panel.