Where to Buy Ipamorelin in 2026: Sizes, Purity Reports & Verification

Ipamorelin (research code NNC 26-0161) is a synthetic pentapeptide amide, Aib-His-D-2-Nal-D-Phe-Lys-NH2, with the molecular formula C38H49N9O5 and a molecular weight of 711.85 g/mol. Pepta Labs lists it in 5 mg and 10 mg vials at 99.2% reported RP-HPLC purity. This guide covers the chemistry behind the listing, how to read the purity and identity report, storage, and where the compound stands with the FDA in 2026.

What Is Ipamorelin?

Only two of the five residues, histidine and lysine, are standard L-amino acids. The N-terminal residue is alpha-aminoisobutyric acid (Aib, 2-methylalanine), position 3 is 3-(2-naphthyl)-D-alanine and position 4 is D-phenylalanine; the C-terminus is a primary amide rather than a free acid. These features matter to a buyer because they make the molecule distinctive by mass and by HPLC retention. A report for a five-residue peptide built only from standard amino acids could not match the formula above.

Free base, acetate and trifluoroacetate

CAS 170851-70-4, the formula C38H49N9O5 and 711.85 g/mol all describe the free base. The material in the vial is a salt, most often ipamorelin acetate and sometimes the trifluoroacetate. Ipamorelin has three basic sites (the N-terminal amine, the histidine imidazole and the lysine side-chain amine), so more than one counter-ion can accompany each peptide and the salt weighs more per molecule than 711.85. The label quantity refers to the salt as weighed, and the net peptide content on the report converts that figure to peptide. See TFA vs acetate and net peptide content and CAS numbers and molecular weights.

How Pepta Labs Lists Ipamorelin

Both listings carry the same specification: lyophilized powder in a sealed glass vial, reported reversed-phase HPLC purity of 99.2% on the product page, and identity confirmed by mass spectrometry. The analytical report is sent by email on request, without an account or a minimum order. Salt form and net peptide content are stated on it. The category page lists the GRF-derived compounds (16 to 44 residues) Pepta Labs stocks alongside ipamorelin.

How to Verify an Ipamorelin Listing

What an HPLC/MS report shows

A reversed-phase HPLC chromatogram separates the peptide from synthesis by-products (deletion sequences, incompletely deprotected residues, oxidation products) and reports the main peak as a percentage of total peak area. Mass spectrometry, usually electrospray, reports the mass of the main peak so it can be compared with the theoretical value for C38H49N9O5. A report that shows both, with the batch identifier and the testing laboratory's name, is the minimum a listing should be able to produce. Our HPLC vs mass spec article explains what each instrument can and cannot resolve.

What it does not show

• Purity by peak area is relative. It does not include counter-ion or water, so a 99.2% purity and a net peptide content of, say, 85% are not in conflict.
• Standard RP-HPLC and MS cannot confirm the D-configuration at positions 3 and 4. A peptide with L-2-Nal or L-Phe at those positions has the same formula and mass; only chiral amino-acid analysis distinguishes them.
• Neither test is a sterility or endotoxin result, and neither speaks to how the vial was handled after testing.

Production-run report vs lot-specific COA

Pepta Labs supplies the analytical report for the sourced production run, commissioned from an independent laboratory. A lot-specific certificate of analysis is generated per fill lot after vialling and may carry a different date and identifier. Either document is legitimate if the identifier on your vial matches it. Our COA verification guide lists the fields to check, including the laboratory name, method, column, test date and signatory.

Comparing observed mass to theoretical mass

For C38H49N9O5 the monoisotopic mass is 711.39 Da and the average mass is 711.85. Electrospray reports typically show [M+H]⁺ near m/z 712.4 and [M+2H]²⁺ near m/z 356.7; a deconvoluted mass of 711.4 (monoisotopic) or 711.9 (average) is consistent with the listing. The acetate or trifluoroacetate counter-ion is not part of the observed peptide mass, because the salt dissociates in the ion source. A deconvoluted mass that differs from theory by more than about 1 Da points to a different sequence, an incomplete deprotection or a transcription error, and is worth a query before ordering.

Storage and Shipping

Ipamorelin ships as a lyophilized powder at ambient temperature and does not need cold packs for a few days in transit. On arrival, refrigerate sealed vials at 2-8 C or move them to -20 C for long-term storage. Keep the vial sealed and dry, protected from light. The solid is white to off-white. Most orders ship the next business day with free US shipping.

US Regulatory Status in 2026

Ipamorelin is not a controlled substance. Its FDA position concerns pharmacy compounding under sections 503A and 503B, not laboratory sale. FDA's list of bulk drug substances that may present significant safety risks, updated 22 April 2026, shows "Ipamorelin acetate" in the active Category 2 table with the 503B column marked and a date added of 29 September 2023. The same page places the substance among those "nominated but withdrawn" for the 503A interim policy, meaning the 503A nomination was withdrawn by the nominators while the 503B Category 2 entry stands. Category 2 placement bars the substance from compounding under the relevant interim policy; it does not govern sale as a research chemical with research-use-only labelling. Status is summarised at peptide legal status 2026 and FDA Category 2 peptides 2026.

Frequently Asked Questions

What does CAS 170851-70-4 identify?

The free base of ipamorelin, Aib-His-D-2-Nal-D-Phe-Lys-NH2 (C38H49N9O5, 711.85 g/mol), matching PubChem CID 9831659 and UNII Y9M3S784Z6. Ipamorelin acetate is the same peptide with an acetate counter-ion; a listing may show either name.

Which residues in ipamorelin are non-standard?

Aib at position 1, 3-(2-naphthyl)-D-alanine at position 3 and D-phenylalanine at position 4. Only histidine and lysine are standard L-amino acids, and the C-terminus is a primary amide.

What ions should the mass spectrum show?

[M+H]⁺ near m/z 712.4 and [M+2H]²⁺ near m/z 356.7, from a monoisotopic mass of 711.39 Da. The report lists the observed value next to the RP-HPLC purity.

Is the 10 mg vial the same material as the 5 mg vial?

Both carry the same reported purity (99.2%) and the same identity testing; only the fill quantity and price differ. The report for each production run states the salt form and net peptide content that apply.

Where to Buy Ipamorelin

All products are supplied for laboratory research use only and are not for human or animal use.