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New — The Peptide Dictionary: 128 terms, explained simply
New guide — NAD+ for Anti-Aging: What the Science Says
New guide — GHK-Cu: the copper peptide for your skin
Not sure where to start? — A 60-second quiz points you to the path that fits your goal
New explainer — Semaglutide: what the research says, made simple
Browse — Peptide guides, made simple
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Peptides.io Research

Original research

Data analysis built from primary government sources. Every report publishes its methodology, its dataset and its limitations, so the numbers can be checked rather than taken on trust.

Original research

The Gray-Market Peptide Report 2026

Americans search for "research use only" peptides more than a million times a month. We tracked 21 compounds across search demand, clinical evidence, lab tests, adverse event reports and enforcement.

21
compounds tracked
4.7x
search growth since 2024
1.12M
US searches per month
27x
retatrutide growth
Read the analysis →
Original research

GLP-1 Treatment Gap Index 2026

A state ranking comparing adult obesity and diabetes prevalence against Medicaid GLP-1 prescribing, for all 50 states and DC.

51
states and DC
8.8x
spread in access
r = 0.02
need vs access
11.2M
prescriptions analysed
Read the analysis →
How we work. Each report states where the data came from, how the measure was built, and what it cannot show. Where a finding rests on an assumption, the assumption is named. Journalists and researchers are welcome to cite or reuse these findings with attribution to Peptides.io.