- PlexusDx reads 57 gene markers across 49 peptides and adds blood testing. Broader health platform, US-based.
- PeptidesDNA reads a 144-marker panel and ranks 39 peptides for you, with every association labelled by how strong the evidence behind it is.
- Already have 23andMe or AncestryDNA data? PeptidesDNA analyses it for $99. PlexusDx requires their own kit.
- PlexusDx covers more compounds and adds bloodwork. PeptidesDNA reads more markers per compound and works from data you already have.
Until recently, "genetic peptide testing" wasn't really a category. In 2026, two companies have launched dedicated products in this space: PlexusDx (based in the US) and PeptidesDNA (shipping worldwide). If you're considering a genetic test to guide your peptide protocol, here's how they compare.
Disclosure: This comparison is published by PeptidesDNA. We've made every effort to be accurate and fair. We encourage you to verify claims on PlexusDx's website directly.
How do PlexusDx and PeptidesDNA compare feature by feature?
| Feature | PlexusDx | PeptidesDNA |
|---|---|---|
| Gene markers read | 57 | 144 |
| Peptides ranked in your report | 49 | 39 |
| Peptides documented in the reference library | Not stated | 46 |
| Evidence labelling | Not explicitly tiered | Every association labelled Tier 1, 2 or 3 |
| Blood testing | Yes: hormones, methylation, metabolic | Genetic only |
| Upload existing DNA | Own kit required | 23andMe, AncestryDNA, MyHeritage, Nebula |
| Upload price | N/A | $99 one-time |
| No existing DNA data? | Own kit required | Routed to a DNA-test partner |
| Report format | Online portal | PDF download plus dashboard |
PlexusDx ranks more compounds (49 against 39). PeptidesDNA reads more of your genome to do it (144 markers against 57) and tells you how solid the evidence is behind each match rather than presenting every association as equally settled. More compounds is not automatically better: what you want is to know which handful are worth your attention and how confident anyone should be about that.
Where PlexusDx wins
PlexusDx puts blood biomarker testing next to the genetics: hormones, methylation panels, metabolic markers, all in one portal. That gives a fuller picture of what is happening in your body right now, which genetics alone cannot show. If you want both in one place, PlexusDx has it and we do not.
Who Should Choose PlexusDx?
- You want genetic + blood testing in one platform
- You want the wider compound list (49 peptides)
- You're US-based and prefer a CLIA-certified lab
- You're also interested in their methylation, hormone, or cognition tests
Who Should Choose PeptidesDNA?
- You want more of your genome read per compound (a 144-marker panel)
- You already have 23andMe or AncestryDNA data and want it analysed for $99
- You want each result labelled by how strong the evidence behind it is, rather than presented flat
- You want full control over your genetic data, with the right to delete it at any time
- You want a one-time purchase with no subscription
Breadth against depth: two reasonable answers to a new question.
PlexusDx takes the platform approach: genetics plus blood testing, several test types, US lab infrastructure. PeptidesDNA takes the specialist approach: a 144-marker panel, 39 peptides ranked, an evidence label on every association, and a $99 analysis of DNA data you already have. If you want a broad health testing platform, PlexusDx is worth evaluating. If you already have your raw data and want it read specifically for peptides, that is what we built.
Frequently asked questions
Is PlexusDx better than PeptidesDNA?
It depends what you want. PlexusDx ranks more compounds (49 against 39) and puts blood testing alongside the genetics, which is a genuine advantage we do not match. PeptidesDNA reads more markers (144 against 57), labels every association by how strong the evidence is, and analyses DNA data you already have for $99.
Can I upload my 23andMe data to PlexusDx?
PlexusDx's current platform appears to use their own testing kits rather than accepting uploads from other providers. PeptidesDNA accepts raw data uploads from 23andMe (v5), AncestryDNA, MyHeritage, and Nebula Genomics, so if you already have DNA data you can get a peptide report for $99 without ordering another kit.
Which test covers more peptides?
PlexusDx covers 49 peptides across 14 pathways. A PeptidesDNA report ranks 39 peptides across 15 pathways, with 46 documented in the reference library. We read more of your genome to do it, 144 markers against 57. More compounds is not automatically better: what decides anything is knowing which few are worth your attention and how confident anyone should be about that.
Which genetic peptide test is cheaper?
PeptidesDNA charges $99 to analyse DNA data you already have (23andMe, AncestryDNA and similar). If you don't have any, we route you to a third-party DNA-test partner rather than selling a kit ourselves. PlexusDx pricing varies by test, so check plexusdx.com for current figures. Both are one-off costs rather than the annual subscription model SelfDecode uses.
This article is for informational and educational purposes only. It is not medical advice and does not diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before starting any peptide protocol. Individual results vary. Some outbound links are affiliate links, at no extra cost to you.