- PlexusDx reads 57 gene markers across 49 peptides and adds blood testing. It is a broader US health testing platform with its own kit.
- PeptidesDNA reads a 144-marker panel against the published research on 31 peptides, with every association labelled by the strength of the evidence behind it.
- PeptidesDNA works from DNA data you already have (23andMe, AncestryDNA and others) for $99. PlexusDx requires its own kit.
- Neither report is a guide to using any peptide. For most peptides, no study has tested whether any genotype changes response.
Until recently, genetic reports on peptides were not really a category. In 2026, two companies offer dedicated products: PlexusDx and PeptidesDNA. Here is how they compare.
Disclosure: This comparison is published by PeptidesDNA. We have tried to be accurate and fair, and we encourage you to check PlexusDx's claims on its own website.
How do PlexusDx and PeptidesDNA compare feature by feature?
| Feature | PlexusDx | PeptidesDNA |
|---|---|---|
| Gene markers read | 57 | 144 |
| Peptides covered in the report | 49 | 31 |
| Peptides documented in the reference library | Not stated | 46 |
| Evidence labelling | Not explicitly tiered | Every association labelled by evidence strength |
| 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 |
Neither report is a guide to using any peptide. For most peptides, no study has tested whether any genotype changes response. What a genetic report can do is show which variants you carry, what the human research has linked them to, and how strong that research is.
Where PlexusDx is different
PlexusDx puts blood biomarker testing next to the genetics: hormones, methylation panels and metabolic markers in one portal. Blood tests show what is happening in the body now, which genetics alone cannot. If you want both in one place, PlexusDx offers that and we do not.
Who might choose PlexusDx?
- You want genetic and blood testing in one platform
- You want the longer compound list (49 peptides)
- You prefer a test run in a CLIA-certified laboratory
- You are also interested in its methylation, hormone or cognition tests
Who might choose PeptidesDNA?
- You already have 23andMe or AncestryDNA data and want it read against the peptide research for $99
- You want more of your file read (a 144-marker panel)
- You want each association labelled by the strength of the evidence behind it, including where no study has tested a genotype at all
- You want control over your genetic data, with the right to delete it
- You want a one-time purchase with no subscription
Breadth against depth.
PlexusDx takes the platform approach: genetics plus blood testing and several test types. PeptidesDNA takes the specialist approach: a 144-marker panel read against the published research on 31 peptides, 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 to know what the peptide research says about it, and does not say, that is what we built.
Frequently asked questions
Is PlexusDx better than PeptidesDNA?
It depends what you want. PlexusDx covers more compounds (49 against 31) and adds blood testing, which we do not offer. PeptidesDNA reads more markers (144 against 57), labels every association by evidence strength, and analyses DNA data you already have for $99.
Can I upload my 23andMe data to PlexusDx?
PlexusDx's current platform appears to use its own testing kits rather than accepting uploads from other providers. PeptidesDNA accepts raw data from 23andMe (v5), AncestryDNA, MyHeritage and Nebula Genomics, so if you already have DNA data you can get a report for $99 without ordering another kit.
Can either report predict how I would respond to a peptide?
No. For most peptides, no study has tested whether any genotype changes response, and neither report replaces a clinician. A genetic report can show which variants you carry, what human research has linked them to, and how strong that evidence is.
Which genetic peptide test is cheaper?
PeptidesDNA charges $99 to analyse DNA data you already have. If you do not 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 its website for current figures. Both are one-off costs rather than a subscription.
This article is for informational and educational purposes only. It reports what published research found; it is not medical advice, it does not diagnose, treat, cure or prevent any disease, and nothing in it is a dose or a recommendation to use any compound. Talk to a licensed clinician about any medical decision.