The GH peptide market has its own specific scam patterns that differ from the GLP-1 counterfeit problem. The compounds are smaller, the synthesis is more accessible to a wider range of manufacturers, and the price-per-mg is generally lower — which shifts the economic incentives for cheating in different directions. This thread covers the specific patterns to watch for.
Pattern 1: The GHRP-2-as-ipamorelin substitution.
This is the single most common substitution in this category. Ipamorelin is the most expensive ghrelin mimetic to synthesize because of its specific structural requirements that produce the selectivity profile (low cortisol elevation, low prolactin elevation, minimal hunger). GHRP-2 is significantly cheaper to make and produces stronger acute GH release than ipamorelin — but with cortisol elevation, prolactin elevation, and a different side effect pattern. Buyers who receive GHRP-2 labeled as ipamorelin experience "GH peptide effects" and assume the product is legitimate, but the effects they experience are not what ipamorelin actually produces.
How to detect it: mass spectrometry confirmation. Ipamorelin is 711.85 Da. GHRP-2 is 817.98 Da. The molecular weights differ by over 100 Da — any reasonably accurate mass spec catches this trivially. Demand mass spec on the COA. If the COA shows a mass matching GHRP-2 but the product is labeled ipamorelin, that is unambiguous fraud.
How to detect it from subjective response: ipamorelin specifically does not produce noticeable hunger increase or noticeable cortisol-related effects (jitteriness, increased anxiety, sleep disturbance from cortisol elevation). If a labeled-ipamorelin product produces those effects, it is likely GHRP-2.
Pattern 2: The CJC-1295 DAC versus without-DAC substitution.
CJC-1295 with DAC is more expensive to synthesize than CJC-1295 without DAC. The molecular weight difference is approximately 280 Da (the DAC moiety). Mass spec catches this trivially — but a vendor providing only HPLC and not mass spec on the COA is providing inadequate documentation, and the substitution is invisible from HPLC alone since both compounds are pure when synthesized correctly.
How to detect it: mass spec confirming the with-DAC molecular weight (3647.96 Da) versus the without-DAC molecular weight (3367.85 Da). If the COA does not include mass spec or shows the without-DAC value, the product is not what the label claims.
How to detect it from subjective response: with-DAC has a half-life of 6-8 days and produces sustained baseline GH elevation. Without-DAC has a half-life of about 30 minutes and produces sharp pulses. A research protocol designed around with-DAC dosing patterns (typically once or twice weekly) would feel substantially different if the product were actually without-DAC.
Pattern 3: The MK-677 quality variation.
MK-677 is a small molecule (528.66 Da), not a peptide. It is synthesized through standard organic chemistry rather than peptide synthesis. The quality variation in this category comes from synthesis purity — particularly residual solvents and synthesis byproducts. MK-677 is also the only compound in this category that is orally administered, which means GI side effects from impure product show up immediately.
How to detect quality issues: HPLC purity should be above 98% for MK-677. Residual solvent testing (gas chromatography) is more relevant for small-molecule synthesis than for peptide synthesis and a quality vendor should provide it.
Pattern 4: The acetate-content concealment.
This is not exactly a scam but is information opacity that benefits the vendor at the buyer's expense. Peptides synthesized via SPPS contain acetate (or TFA) as a salt, typically 5-15% by mass. A 5mg vial labeled by total mass may contain 4.25-4.75mg of active peptide. Vendors who do not disclose acetate content or net peptide content are technically not lying but are providing less useful documentation. A vendor who reports "5mg net peptide" is providing more useful information than a vendor who reports "5mg" total mass with no acetate disclosure.
How to detect it: ask the vendor directly whether the labeled mass is total mass or net peptide content. A vendor who cannot answer or gives a vague answer is signaling lower documentation standards.
Pattern 5: The "tesamorelin" that is actually CJC-1295.
Tesamorelin is a specific 44-amino-acid GHRH analog with a particular hexenoic acid modification. It is more expensive to synthesize than CJC-1295 (29 amino acids) and the molecular weights differ substantially (5135.81 Da versus 3367.85 Da without DAC, 3647.96 Da with DAC). A vendor selling CJC-1295 labeled as tesamorelin is committing a clear substitution that mass spec catches.
How to detect it: mass spec confirmation of the tesamorelin molecular weight. If the COA shows a mass matching CJC-1295 (with or without DAC), the product is not tesamorelin regardless of what the label says.
Pattern 6: The "research peptide blend" mystery vial.
Some vendors sell pre-mixed combination products — "CJC + ipamorelin blend" or similar. These are particularly problematic for quality verification because the COA can show purity for a "blend" without separating out the individual compound concentrations. The Red Flags thread in the Stacks & Protocols category covers pre-mixed scams in detail; in this category specifically, the pattern is to sell what is largely the cheaper compound with a token amount of the more expensive one.
How to detect it: avoid pre-mixed products from any vendor who cannot provide separate quantitative content for each compound in the blend. Mixing is something the researcher can do at the time of reconstitution; there is no quality reason to buy pre-mixed.
What to do if a suspect vendor was already used.
Document the COA received. If the vial arrived, get it tested independently if possible. Post specific findings on the platform with vendor name and batch number. Community-sourced quality data is the strongest defense against these substitution patterns — the fewer the buyers who encounter a fraudulent vendor without warning, the faster the vendor's reputation collapses.
If you are shopping for a vendor in this category and you are not sure how to evaluate the COA, post a redacted COA in the Quality and COA discussion thread and the community can help you read it.
