The research peptide market has little regulation, and quality varies widely. These twelve warning signs will help you screen out suppliers before you spend money on a GLOW blend or any other peptide.
Documentation red flags
- No COA, or a COA “on request” that never arrives.
- COAs without lot numbers, or one COA reused across many batches.
- HPLC purity only, with no mass spec, so identity is never confirmed.
- An unnamed or unverifiable testing lab.
- A blend COA with a single purity number and no component-level data.
Marketing red flags
- Health, beauty or weight-loss claims about a “research use only” product.
- Dosing protocols or injection instructions presented as advice.
- Before-and-after photos or testimonials about personal use.
- Prices far below the market with no explanation. See our price guide.
Business red flags
- No physical address, company name or working contact details.
- Payment only by untraceable methods, with no refund or return policy.
- Labels without lot numbers, fill amounts or dates.
What a trustworthy supplier looks like
- Lot-matched third-party COAs
- HPLC + MS for every component
- Research-use-only language
- Transparent company details
- Clear storage and shipping practices
Put these checks together in our GLOW buyer’s checklist, and learn to verify documents with how to read a peptide COA.
Educational content only. Buy GLOW Stack doesn’t sell or endorse any supplier. Research peptides are not for human or veterinary use.