Ask whether any ingredient claim holds up. One call returns a graded, sourced, signed answer.
Every answer traces to peer-reviewed sources, signed at the moment of the call.
"ingredient": "ashwagandha",
"outcome": "sleep",
"dose_mg": 600,
"attest": true
"grade": "B",
"dose_match": "MATCH",
"pmids": [32818573, 34559859],
"studies": 14,
"verified": true,
"attest":
"id": "pbr_ashw_sl_v3",
"ts": "2026-07-02T04:00Z",
"hmac": "d4f1…a93c"
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Send an ingredient and the claim you want to stand behind. Probara grades it against the published literature and returns a signed attestation you can show anyone.
Send the ingredient name, target outcome, and your labelled dose. Authenticate with your API key.
GRADE certainty (A–D), dose-match verdict, study count, N-total, and PMID-cited summaries: all structured JSON.
Recompute the HMAC locally. Match means the card is byte-for-byte identical to the server output (tamper-evident by design).
No black-box score. Each grade opens to the studies behind it: design, sample size, dose match, and the signature that locks it.
The FTC expects competent, reliable evidence behind every health claim. Probara hands you the paper trail before you print the label.
Traceable provenance. Every card names the PMID, corpus version, and query parameters that produced it.
Reproducible. Same ingredient, outcome, and corpus version returns the same card. Your auditor can replay the call.
Tamper-evident HMAC. The signed attestation proves the card is byte-for-byte identical to the server output. Nobody touched it.
PubMed citations indexed in the evidence corpus
SOURCE: NLM / PubMed public catalog. Illustrative of index depth at launch.
Every attestation is signed, timestamped, and checkable at a public URL. You don't have to trust us. You can verify.
All API traffic is TLS 1.3 encrypted. Every evidence card is HMAC-signed and verifiable: recompute with your shared API key to confirm integrity.
Every query logs the corpus version, query parameters, and attestation ID. Your compliance team has a full reconstruction path.
The corpus version is embedded in every card response. Pin a version, replay any query, get the identical card. No moving targets.
Get a key and make your first signed call in under five minutes.
Free tier
10 attested evidence cards per month. No credit card required. Your key arrives by email with a quickstart link.