Peptide Scanner, London
The top US peptide suppliers on Peptide Scanner, November 2026
Of the 429 US research peptide shops we score, Zenith Bioscience came first on 4 November 2026. Four shops made the top 1%.
On 4 November 2026 we ranked the 429 research peptide shops we score in the US. Zenith Bioscience came first, with 35 of 60. It was also first of all 892 shops worldwide. Modified Aminos, Glacier Aminos and Power Peptides complete the US top 1%.
The score adds up three things we can check from outside: lab certificates (25 points), reviews (20) and what people say on forums and Reddit (15). Another 40 points are for our own lab test. We have not lab-tested any shop in this list, so the most they can score today is 60. The typical shop scores 16.
A high rank means a shop has more public proof than others. It does not mean a product is pure, or that everything the shop says is true. Where a shop's own page shows a problem, we list it next to the score. Read the full page before you trust a rank.
No shop pays for its score or its badge. The badge is for November 2026 only. We rank again every month, and a shop can lose it.
Zenith Bioscience
No. 1 in the US · 1st of 429 · 35 of 60
Certificates 21 of 25 · Reviews 9.2 of 20 · Community 4.5 of 15
We hold 107 of its lab certificates, all from one lab, Kovera Labs. We only started tracking it in September 2026.
Modified Aminos
Top 1% in the US · 2nd of 429 · 34 of 60
Certificates 21.2 of 25 · Reviews 10 of 20 · Community 3 of 15
Forum and Reddit talk raises serious concerns. On its own certificates, 29 of 53 measured vials are more than 3% over or under the label.
Glacier Aminos
Top 1% in the US · 3rd of 429 · 34 of 60
Certificates 19.6 of 25 · Reviews 8.4 of 20 · Community 6 of 15
On its own certificates, 171 of 198 measured vials are more than 3% over or under the label.
Power Peptides
Top 1% in the US · 4th of 429 · 34 of 60
Certificates 16.7 of 25 · Reviews 12.8 of 20 · Community 4.5 of 15
We checked 7 of its own claims against the documents it publishes, and 6 do not match.