AssayIndex
Tissue-repair and immunomodulatory peptides

Thymulin

serum thymic factor · FTS · thymulin (Zn) · C35H55N9O17 · monoisotopic 873.3716 Da. The index holds 18 assay reports on this compound across 3 batches from 3 suppliers.

18 reports3 batchesmedian 99.06 %index spec 98.0 %
Section 1

Analytical fingerprint

Hand-authored chemistry. These properties describe the substance and do not change when a record is added.

Thymulin's biological activity is zinc-dependent, so the same caveat as GHK-Cu applies in weaker form: an acidic mobile phase strips the metal and the chromatogram reports the apo-peptide. The index records thymulin purity as peptide purity and notes zinc separately where a number is supplied, which is rarely. Very thin coverage.

Molecular formula
C35H55N9O17
Monoisotopic mass
873.3716Da
Average mass
873.87Da
Residues
9
Nominal retention (RG-2, 30 min)
6.62min
Retention window
0.25min
Counter-ion as usually shipped
acetate
Typical label claims
2 mg · 5 mg · 10 mg
Analytical difficulty (index scale)
1.00 — straightforward
Purity is a defined quantity
YES
Section 2

Representative chromatogram

Drawn from this page's own medians. Not a scan, not an illustration, and not any single report.

0404180821212316164 Thymulin6.62 min · 99.06 % 6.34 same trace · ×100 vertical expansion, baseline-corrected · main peak off-scale reporting threshold 0.05 % area 05101520253035 Retention time (min) Response (mAU)
Figure 1. A representative Thymulin trace on the index reference method RG-2, constructed from this page's own numbers: the main peak carries the index median purity of 99.06 % area at the nominal retention time of 6.62 min, and each impurity peak carries the median area the index has observed for that named species at its characteristic retention offset. It is not a scan of any single report — every individual record's own chromatogram is on its own page. The lower panel is the same trace at a stated vertical expansion, baseline-corrected, so the impurities are visible; the main peak runs off-scale there by design. Baseline noise is seeded from the compound slug.
Section 3

What the index has observed

Arithmetic over the 18 records the index holds. Aggregates on this page are computed over the records the index holds, which are not a random sample of the material on the market. Lots that get tested are lots someone chose to test. Read every figure here as a description of this dataset rather than as an estimate of a population.

Median purity 99.06% n=18
Interquartile range 0.27pp n=18
Minimum 98.35% n=18
Maximum 99.63% n=18
Pass rate vs spec 100.0% n=18
Median recovery vs claim 95.3% n=10
Median water 3.69% n=18
Median |mass error| 2.0ppm n=16
03692.093.094.095.096.097.098.099.0100.092.00–92.25 %: n=092.25–92.50 %: n=092.50–92.75 %: n=092.75–93.00 %: n=093.00–93.25 %: n=093.25–93.50 %: n=093.50–93.75 %: n=093.75–94.00 %: n=094.00–94.25 %: n=094.25–94.50 %: n=094.50–94.75 %: n=094.75–95.00 %: n=095.00–95.25 %: n=095.25–95.50 %: n=095.50–95.75 %: n=095.75–96.00 %: n=096.00–96.25 %: n=096.25–96.50 %: n=096.50–96.75 %: n=096.75–97.00 %: n=097.00–97.25 %: n=097.25–97.50 %: n=097.50–97.75 %: n=097.75–98.00 %: n=098.00–98.25 %: n=098.25–98.50 %: n=298.50–98.75 %: n=098.75–99.00 %: n=399.00–99.25 %: n=899.25–99.50 %: n=499.50–99.75 %: n=199.75–100.00 %: n=0median 99.06 Purity (% area) Reports
Figure 2. Purity distribution across all 18 Thymulin records. Dashed line is this compound's median (99.06 %); the solid vertical is the index acceptance specification for the tissue-repair and immunomodulatory peptides class (98.0 %). Domain is fixed at 92–100 % on every purity histogram on this site so that compounds can be compared by eye — a wide distribution here is a hard compound, a narrow one is an easy one, and neither is a statement about the suppliers.
Section 4

By supplier

Suppliers with fewer than two purity records on this compound are omitted from the figure rather than drawn as a line. The full table, including the thin cells, is on the by-supplier page.

98.298.598.799.099.299.599.7WWBWWB: Q1 99.04, median 99.12, Q3 99.36, n=13n=13GGPepsGGPeps: Q1 98.42, median 98.72, Q3 99.00, n=4n=4 Purity (% area)
Figure 3. Thymulin purity by supplier, ordered by coverage. The vertical line is the index acceptance specification. Boxes that overlap are suppliers this dataset cannot separate, and most of them overlap.

Full per-supplier table with n= caveats →

Section 5

Characteristic impurities and degradants

The left three columns are authored chemistry — what this molecule characteristically carries and where it elutes. The right three are what the index has actually reported.

Named speciesΔRT (min, RG-2)Δ mass (Da)Seen inMedian % areaMax % area
des-Ser truncate (−87 Da)-0.28-87.032100%0.470.86
deamidated (+1 Da)-0.18+0.984100%0.080.99
zinc-free apo-thymulin-0.40-63.929100%0.050.28
diketopiperazine (−18 Da)+0.22-18.011100%0.150.66

Degradation pathways

  • zinc dissociation
  • Asn deamidation

Full impurity profile, with what each named species implies about the synthesis →

Section 7

Quarterly coverage

QuarterReportsMedian purityRange
2024-Q10n<3—
2024-Q20n<3—
2024-Q30n<3—
2024-Q40n<3—
2025-Q10n<3—
2025-Q20n<3—
2025-Q30n<3—
2025-Q40n<3—
2026-Q1598.9898.35–99.14
2026-Q21399.1298.76–99.63
2026-Q30n<3—

Quarter-by-quarter detail →

Section 8

Most recent records

The 25 most recent Thymulin records of 18.
ReportSupplierLotLabQuarterPurity %Water %Recovery %ProvenanceFlagsResult
AX-2026-041219WWBWWB-2602-S2129PeptideMeter2026-Q299.043.7989.7Supplier-supplied2MARGINAL
AX-2026-041216WWBWWB-2602-S2129Kestrel2026-Q299.464.0294.9Supplier-supplied1MARGINAL
AX-2026-041215WWBWWB-2602-S2129Nordanalyt2026-Q299.474.23—Supplier-supplied1MARGINAL
AX-2026-041218WWBWWB-2602-S2129Janoshik2026-Q299.634.40105.7Supplier-supplied1MARGINAL
AX-2026-041221WWBWWB-2602-S2129Nordanalyt2026-Q299.013.8692.6Supplier-supplied1MARGINAL
AX-2026-041223WWBWWB-2602-S2129Janoshik2026-Q299.173.78—Supplier-supplied1MARGINAL
AX-2026-041222WWBWWB-2602-S2129VendorInvestigate2026-Q298.763.36105.6Buyer-sourced1MARGINAL
AX-2026-041214WWBWWB-2602-S2129PeptideMeter2026-Q298.914.03—Supplier-supplied2MARGINAL
AX-2026-041220WWBWWB-2602-S2129PeptideMeter2026-Q299.053.36—Supplier-supplied1MARGINAL
AX-2026-041224WWBWWB-2602-S2129Janoshik2026-Q299.293.57—Supplier-supplied1MARGINAL
AX-2026-041225WWBWWB-2602-S2129PeptideMeter2026-Q299.073.61106.3Supplier-supplied1MARGINAL
AX-2026-041226WWBWWB-2602-S2129Janoshik2026-Q299.364.1988.6Supplier-supplied2MARGINAL
AX-2026-041217WWBWWB-2602-S2129Janoshik2026-Q299.123.60—Supplier-supplied1MARGINAL
AX-2026-042795GGPepsGGPE-2510-C1982PeptideMeter2026-Q198.981.27—Supplier-supplied0PASS
AX-2026-041878JEEPJEEP-2602-T3807PeptideMeter2026-Q199.145.2595.6Supplier-supplied1MARGINAL
AX-2026-042792GGPepsGGPE-2510-C1982Janoshik2026-Q199.062.03104.2Supplier-supplied0PASS
AX-2026-042793GGPepsGGPE-2510-C1982Janoshik2026-Q198.352.3191.4Supplier-supplied0PASS
AX-2026-042794GGPepsGGPE-2510-C1982VendorInvestigate2026-Q198.451.84—Buyer-sourced0PASS