/Companies

adyn

YC S20

Seattle, US · Founded 2019 · 7 employees · Hiring · 20 known investors

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Adyn uses large inclusive datasets and machine learning to advance personalized medicine for historically under-researched health conditions, with initial focus on reproductive disorders. The company aims to close race and gender knowledge gaps in medical research.

Also known as ADYN, Adyn · Adyn · adyn.com

Founders & leadership· Y Combinator alumni (S20)

adyn was founded in 2019 by Elizabeth Ruzzo.

ERElizabeth Ruzzo
Elizabeth RuzzoFounder, CEOElizabeth Ruzzo is a geneticist with background in medical genetics, neuroscience, bioinformatics, and machine learning, and experience communicating scientific findings in research and fundraising contexts. She founded Adyn, which applies machine learning to medical data to advance personalized medicine for reproductive and other under-researched conditions.
ER
Emily RuzzoRecruiter

Investors · 20

M13listed by M13New York · $4M – $7M

How we know: a partner's Signal profile · research · finsmes.com · open dataset · 5k.vc investor directory · Y Combinator's founder network · m13.co · Not right? Tell us

Pioneerlisted by PioneerToronto, Ontario

How we know: Y Combinator's founder network · pioneerfund.vc · Not right? Tell us

InvestcorpreportedManama

How we know: Y Combinator's founder network · Not right? Tell us

Sanctum Venturesreported

How we know: Y Combinator's founder network · Not right? Tell us

Also in the syndicate · 7

Anne WojcickiAscend VCAshley MayerCivilization VenturesMadrona Pioneer FundNish BhatQasar Younis

Company profile

researched Aug 2026

adyn is a Seattle-based precision medicine company whose flagship product, The Birth Control Test, is marketed as the first and only test designed to prevent birth control side effects. Customers collect samples at home: saliva is used for DNA analysis and a finger-prick blood sample is used to measure levels of six key hormones. Samples are processed at CLIA-certified laboratories, and results are interpreted against a body of peer-reviewed research (the company cites over 50 studies in its FAQ and 60+ publications elsewhere on its site) to estimate an individual's risk of specific side effects across available contraceptive options.

Results are combined with the customer's medical history, prior experiences, preferences, and health goals and reviewed in a virtual visit with a licensed medical provider trained in contraceptive counseling. Recommendations cover all highly effective methods — IUDs, the pill, shot, ring, implant, and patch — as well as specific formulations, and the provider can issue a prescription that is shipped to the customer. The company also positions the service for ongoing hormone tracking over time as needs change. At the time of its 2021 seed announcement, the product was described as the Birth Control Optimization Test, assessing hormone baselines and genetic risk for blood clots and depression alongside the side effect profiles of estrogens and progestins used in hormonal contraception, with trained birth control specialists providing ongoing care through a telemedicine platform.

More broadly, adyn states a mission to make scientific discovery more inclusive, applying large inclusive datasets to personalized medicine for historically under-researched health conditions. The company name is derived from the Greek phrase "monadiki dynami" ("unique strength").

Founding story

Founder and CEO Elizabeth Ruzzo, PhD, attributes adyn to a combination of her research background and her own experience with birth control. Ruzzo earned her PhD in human genetics and genomics from Duke University, where she worked with next-generation sequencing and large datasets, and has reported linkages between more than 36 genes and specific human diseases; during a postdoctoral fellowship at UCLA she used machine learning to identify 16 new autism genes. She has more than 20 peer-reviewed publications in journals including AJHG, Cell, Neuron, and Nature, and her awards include the Charles J. Epstein Trainee Award for Excellence in Human Genetics Research, the Jo Rae Wright Fellowship for Outstanding Women in Science, Neurobehavioral Genetics Fellow, the Ray J. Tysor Graduate Fellowship, and Rock Health's 2021 Top 50 in Digital Health. She states a personal motivation to close race and gender knowledge gaps in medical research, noting that birth control is also the most common medicine used to manage reproductive disorders such as endometriosis.

Business model

adyn sells a direct-to-consumer diagnostic package, The Birth Control Test, priced at $369 and eligible for HSA/FSA payment (SIG-IS number 86000949230). The purchase bundles at-home sample collection materials, laboratory analysis of genetic and hormone data, personalized results, and a virtual care visit (described as a 25-minute medical consultation) with a licensed provider who can order the test and write a prescription that is delivered to the customer. Insurance is not accepted at present; the test can also be bought as a gift, with the recipient redeeming a 100% off promo code. Free shipping is offered on orders.

Revenue comes from one-time consumer purchases of The Birth Control Test at $369, including collection materials, lab analysis, personalized results, and a virtual care visit; prescriptions can be fulfilled through the service. Gift purchases of the test provide an additional sales channel. Insurance is not accepted, though HSA and FSA funds are.

Traction

adyn cites customer outcome statistics on its site: 94% of users switched their birth control based on what they learned, 70% learned of a medical risk affecting their birth control, and 97% report confidence in their birth control selection. Y Combinator lists the company as active with a team size of 7 and multiple open roles. The company reports its product is award-winning and that team members' work has appeared in peer-reviewed journals and media outlets.

▸Full profile — market position, technology, go-to-market, geography, history, risks & controversies

Market position

adyn operates in consumer precision medicine and reproductive health, categorized by Y Combinator under fertility tech, machine learning, and consumer health services. It positions its test as complementary to a customer's existing physician and as an alternative to trial-and-error contraceptive selection offered by other online birth control services.

adyn frames itself against other online birth control providers by selling diagnostic information rather than only prescription fulfillment: it measures hormone levels and genetic risk to inform contraceptive selection before a prescription is written, rather than relying on trial and error. The company describes the product as the first and only test designed to prevent birth control side effects, and cites an evidence-based approach drawing on dozens of peer-reviewed studies. It also declines to describe itself as a women's health company, offering gender-affirming contraceptive counseling and provider training in culturally competent care.

Technology

The service combines genotyping of saliva-derived DNA with blood-based measurement of six key hormones, processed at CLIA-certified laboratories using established techniques. Risk estimates for specific contraceptive side effects are derived from more than 50 peer-reviewed studies selected against the company's scientific and statistical standards, integrated with medical history and user preferences to generate personalized recommendations across nearly 200 hormonal birth control products and all highly effective methods. Care delivery is virtual, via a telemedicine platform staffed by providers trained in contraceptive counseling. The founder's background and the company's positioning reference machine learning and large-scale genomic data analysis.

Go-to-market

adyn sells directly to consumers through its website, using an online eligibility quiz, an e-commerce checkout for the test and gift purchases, HSA/FSA payment acceptance, and free shipping. Content marketing via a company blog and social channels (Instagram, X/Twitter, LinkedIn, Facebook, TikTok) supports acquisition, and the site references customer testimonials, product awards, and coverage of the team's work in peer-reviewed publications and media outlets. Gifting is promoted as a channel, including purchases by parents for teenagers with guardian consent.

Birth control users in the US aged 18 or older (under-18 users are served with guardian consent), excluding residents of New York, New Jersey, and Rhode Island. The company targets people starting birth control for the first time, considering switching, experiencing or worried about side effects, managing conditions such as PCOS, PMDD, or acne, parents of teens, and people buying for loved ones. It explicitly serves transgender and gender non-conforming customers and states it does not position itself as a women's health company.

Geography

The company is based in Seattle, Washington and serves customers in the United States only. It cannot ship to New York, New Jersey, or Rhode Island. Job listings are posted as remote within the US.

History

adyn was founded in 2019 and participated in Y Combinator's Summer 2020 batch, with Gustaf Alstromer as its primary partner. In April 2021 the company announced a $2.5 million seed round co-led by Lux Capital and M13. At the time of the seed announcement the flagship product was described as the Birth Control Optimization Test, quantifying hormone baselines and assessing genetic risk for blood clots and depression; the company now markets it as The Birth Control Test, sold with a virtual care visit and prescription fulfillment. Y Combinator's company page lists adyn as active, based in Seattle, with a team size of 7 and open roles including bioinformatician, full stack engineer, and marketing and product positions.

Risks & controversies

The company states it cannot currently accept insurance for The Birth Control Test, which it identifies as an affordability and accessibility constraint it is working to address, and it cannot ship to New York, New Jersey, or Rhode Island.

Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.

Key figures

latest reported
Birth Control Test priceJan 2025$369
HeadcountAug 20269
Hormones measured by The Birth Control TestJan 20256 hormones
Peer-reviewed publications underpinning recommendationsJan 202560+ peer-reviewed publications
Team sizeJan 20257 employees
Users reporting confidence in their birth control selectionJan 202597%
Users who learned of a medical risk impacting their birth controlJan 202570%
Users who switched birth control based on test resultsJan 202594%

Company-reported or press-reported figures, each dated to when it was claimed — not independently audited.

Related companies · 10

LegacyLegacy is a men's fertility and reproductive health company that provides sperm testing, analysis, and banking services. It draws on a medical and scientific advisory board of urologists, reproductive endocrinologists, and andrology researchers.
Modern FertilityModern Fertility provides at-home laboratory tests that measure reproductive health markers, enabling women to access fertility information outside of clinical settings. The company targets women seeking early insight into their reproductive status to inform long-term family planning decisions.
InitoInito provides fertility and reproductive health services, advised by reproductive endocrinologists and infertility specialists.
Carrot FertilityCarrot is a global fertility and family-building platform that provides access to fertility care, maternity support, and family-building guidance for individuals and families. The platform serves members seeking compassionate, personalized reproductive health support.
ClueClue is a menstrual and reproductive health app that lets people track their periods, cycle, ovulation, fertility, and related symptoms, and contributes anonymized data to scientific research with institutions such as Johns Hopkins and the Gates Foundation. The company offers a paid Clue Plus subscription and serves over 12 million users worldwide.
NURXNurx provides accessible and affordable medications and tests through a digital health platform designed for everyone.
Natural CyclesNatural Cycles offers an FDA-cleared mobile app that uses a user's body temperature data and an algorithm to predict fertile windows for hormone-free birth control and pregnancy planning. The app supports women's health across life stages from contraception through perimenopause and is certified in over 35 countries.
Flo HealthFlo is a women's health app offering personalized cycle tracking, fertility guidance, pregnancy support, and health education backed by a medical team. The app serves women and people with periods globally with science-based insights on hormonal health from first period to perimenopause.
Pandia HealthPandia Health is a doctor-founded, women-led telehealth service that provides online consultations with board-certified physicians specializing in hormonal and reproductive care, along with free home delivery of prescriptions. It offers personalized hormone therapy for needs such as birth control, hormonal balance, menopause, and sexual wellness, using medication-matching technology and patient data.
DoctronicDoctronic builds an AI system trained on peer-reviewed medical evidence to provide 24/7 medical triage and consultation, achieving 99.2% alignment with board-certified clinicians. The platform serves patients seeking instant healthcare guidance with no insurance requirement, anonymity, and HIPAA compliance.

Companies working in the same space as adyn.

Timeline · 3

launches, deals, and filings
Apr 2021
adyn closes $2.5M seed round co-led by Lux Capital and M13

Seattle-based precision medicine company adyn announced a $2.5 million seed round, to be used to expand operations and business reach.

$2.5M source ↗

Jan 2021
Founder named to Rock Health's 2021 Top 50 in Digital Health

Founder and CEO Elizabeth Ruzzo, PhD, was included in Rock Health's 2021 Top 50 in Digital Health.

source ↗

Jan 2020
Participated in Y Combinator Summer 2020 batch

adyn is listed in Y Combinator's Summer 2020 batch, with Gustaf Alstromer as primary partner.

source ↗

Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.

Legal entities · 1

corporate structure
ADYN, Inc.

▸Research sources · 8

primary sources listed

8 public sources were cited for this profile; the first-party ones are listed here.

Frequently asked questions

What does adyn do?
adyn sells an at-home genetic and hormone test that helps US users pick a birth control method with lower side effect risk.
Who founded adyn?
adyn was founded by Elizabeth Ruzzo in 2019.
Who are adyn's investors?
adyn's investors include Ascend Venture Capital, Civilization Ventures Management, Llc, Duke Capital Partners, Gaingels, Lux Capital, M13, Pioneer, Westbound Equity Partners and 5 more.
Where is adyn headquartered?
adyn is headquartered in Seattle, US.