Certificate of analysis

TB-500

Sold as 10 mg / vial by Kestrel Peptides.

Batch KP-2405 · Sample OPT-KESTRE · received Jun 14, 2026 · reported Jun 14, 2026

What went wrong, in plain words

LC-MS

Is it the compound on the label?

Molecular ion [M+H]⁺	within tolerance	reference standard	PASS
Sequence match	Confirmed TB-500	reference standard	PASS

Amino acid analysis

Did you get the milligrams you paid for?

Locked

All 14 measured values, the chromatogram and the peak table are free with an account.

No card. Every result publishes either way.

RP-HPLC

What is the rest of the powder?

Main peak		≥ 98.0%
Total related impurities		≤ 2.0%

Peak	RT (min)	Area %
#1	50.0	7.2%
#2	36.0	4.9%
#3	26.9	9.6%

LAL

Is there bacterial debris in it?

Bacterial endotoxin		≤ 10 EU/mg
Microbial bioburden		≤ 10 CFU/mg

ICP-MS

Lead, arsenic, cadmium, mercury.

Industrial solvent left over from making it.