The thinking engine behind every Yesil product. Grounded in the entire indexed medical literature, calibrated for evidence, and equipped with persistent Yesil Memory™ that recalls labs, vitals and conversations across months.
INPUTSteps, sleep, heart rate, labs, vitals, programs, photos, symptoms — every signal you share, in one persistent view.
KNOWLEDGEPulls from 250M+ peer-reviewed papers, every FDA drug label, registered trials and clinical guidelines — at request time.
CONTINUITYPersistent health memory of your labs, conversations and goals — scoped per user, recalled in every new answer.
Generic AI fabricates citations. Yesil Health Intelligence refuses to. Every important answer is retrieved from indexed research before generation — and a citation goes back with the response. When the evidence is weak, the engine says so.

Indexed at request time

Not a chat history. A health-specific persistent memory of your labs, vitals, programs and conversations — scoped per user, weighed in every new answer.
6 months ago
Vitamin D 18 ng/mL
Lab flagged in your records.
5 months ago
Started 2,000 IU
Recorded as new supplement.
1 month ago
Migraine pattern
<6h sleep correlates with episodes.
Today
“How am I doing?”
Engine recalls all of the above in context.
Every signal stays scoped per user. The engine recalls it when the question makes it relevant — not before.
The same engine runs across consumer, clinical and developer.