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RonanRx Inc.

YC S26

San Francisco, US · Founded 2026 · 5 employees · 20 known investors

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RonanRx offers personalized GLP-1 weight-management care delivered via text, where a licensed physician reviews a patient's history to set an individualized dose, titration schedule, and patient-specific adjunct, and a licensed pharmacist at the patient's selected pharmacy verifies and releases compounded, patient-specific prescriptions. It serves individual patients in the US (availability varies by state) and plans to add hormone therapy (HRT).

Also known as Ronan Rx Inc.

Digital HealthHealthtechWellness & FitnessHealth TechTelehealthTherapeuticsUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S26)

RonanRx Inc. was founded in 2026 by Lloyd Armbrust and Emily Colman.

LALloyd Armbrust
Lloyd ArmbrustCEOLloyd Armbrust is a two-time Y Combinator founder who has previously built a manufacturing business and had three company exits. He is the founder of RonanRx, which provides personalized GLP-1 weight-management care and plans to expand into hormone therapy.
ECEmily Colman
Emily ColmanFounderCo-founder and COO of RonanRx, which provides personalized, physician-reviewed GLP-1 weight-management care initiated by text. She is a go-to-market operator with over a decade in healthcare sales, most recently at Eli Lilly.

Investors · 20

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

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Zero Indexlisted by Zero Index

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468 CapitalreportedBerlin

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Active CapitalreportedSan Antonio · $100K – $1M

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Agrolimen Venturesreported

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Batch Venturesreported

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Blast.Clubreported$5.5M

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FundersClubreportedSan Francisco · $290K

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Garage CapitalreportedWaterloo

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ITERATIVEreported$150K – $500K

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Lobster CapitalreportedSan Francisco

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Maiora Rebel Venturesreported

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Metsu Capitalreported

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OurCrowdreportedJerusalem

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Progressive VenturesreportedPalo Alto

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Quanta Ventures Holdings, LLCreported

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RobinhoodreportedMenlo Park

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Roundtable Elyos Energy, SpecialreportedLuxembourg

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Volo VenturesreportedBend · $100K – $300K

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Companies working in the same space as RonanRx Inc..

Legal entities · 1

corporate structure
RonanRx Inc.

In the news

RonanRX: We use AI to personalize peptides to your biologyycombinator.com · Jul 2026

Frequently asked questions

What does RonanRx Inc. do?
RonanRx offers personalized GLP-1 weight-management care delivered via text, where a licensed physician reviews a patient's history to set an individualized dose, titration schedule, and patient-specific adjunct, and a licensed pharmacist at the patient's selected pharmacy verifies and releases compounded, patient-specific prescriptions. It serves individual patients in the US (availability varies by state) and plans to add hormone therapy (HRT).
Who founded RonanRx Inc.?
RonanRx Inc. was founded by Lloyd Armbrust, Emily Colman in 2026.
Who are RonanRx Inc.'s investors?
RonanRx Inc.'s investors include Redbud Trail Group, Y Combinator, Zero Index, 468 Capital, Active Capital, Agrolimen Ventures, Batch Ventures, Blast.Club and 12 more.
Where is RonanRx Inc. headquartered?
RonanRx Inc. is headquartered in San Francisco, US.