YC Summer 2026 (S26) company

Gutgutgoose

We sequence your gut and build the probiotics it’s missing

About Gutgutgoose

Most data companies pay for their data. Ours pays for itself. Customers send us a stool sample. We sequence it, build a metabolic model of that gut, and simulate whether each probiotic strain has an open niche it can colonize. We formulate the best candidates, then re-sequence 90 days later to see what actually took hold and what changed. Each cycle gives us the baseline gut, the intervention, and the outcome. At scale, the endgame is models that predict chronic disease years before symptoms.

Public traction evidence

Each signal links to the public source used for attribution.

  1. Instagram

    Always feeling bloated, sluggish/tired or not seeing gym progress despite training hard & eating clean? Your gut might be the missing piece 💯 @gutgutgoose starts with an at-home microbiome test to help personalize your probiotics based on your unique gut 💪🏿 Link in bio to learn more 👌 #gutgutgoosepartner #guthealth #workout #explorepage #reelsinstagram

    Always feeling bloated, sluggish/tired or not seeing gym progress despite training hard & eating clean? Your gut might be the missing piece 💯 @gutgutgoose starts with an at-home microbiome test to help personalize your probiotics based on your unique gut 💪🏿 Link in bio to...

  2. LinkedIn

    YC’s motto is “Make Something People Want”

    YC’s motto is “Make Something People Want” And that’s exactly what GutGutGoose (YC S26) is doing. We just won the Y Combinator product showcase, and it’s given us a great reminder that we’re working on something that truly resonates with people. Maintaining gut health is one of...

  3. X

    Huge news, today we officially LAUNCH! It's been an incredible journey, interacting with the post will allow us to reach all corners of the internet :) 🪿💚

    Huge news, today we officially LAUNCH! It's been an incredible journey, interacting with the post will allow us to reach all corners of the internet :) 🪿💚

  4. X

    YC’s motto is “Make Something People Want” Last week, we won the @ycombinator product showcase, and it’s given us a great reminder that we’re working on something that truly resonates with people.

    YC’s motto is “Make Something People Want” Last week, we won the @ycombinator product showcase, and it’s given us a great reminder that we’re working on something that truly resonates with people. Stay tuned, huge things coming soon!

  5. Instagram

    Live: Why you should stop taking that probiotic you got from the store!⁣ ⁣ ⁣ Tonight we're talking about something I hear constantly, both from my community and in my own health journey. You're doing everything⁣ right. You're taking your probiotic, you cut the foods everyone says to cut, you're drinking your water, and you still feel bloated, still feel tired, still feel off.⁣ ⁣ I want to walk you through the real reasons why, the stuff that honestly no one tells you. And by the end I'm going to point you toward a free tool that tells you what's actually going on with your gut instead of you guessing.⁣ ⁣ @gutgutgoose Check out the FREE ASSESSMENT TEST in my bio.

    Live: Why you should stop taking that probiotic you got from the store!⁣ ⁣ ⁣ Tonight we're talking about something I hear constantly, both from my community and in my own health journey. You're doing everything⁣ right. You're taking your probiotic, you cut the foods everyone...

  6. Instagram

    Today we officially launch! GutGutGoose makes personalized probiotics that engineer the human microbiome. Personalization is the future of healthcare, yet the entire probiotics industry is still operating under a one-size-fits-all premise. The formulations are made without knowing anything about the individual consuming them. Everyone gets the same bacterial strains, the same dosage, and when nothing works, the customer is left to make another guess. We’ve eliminated the guessing by customizing the pill to every single person. Customers send in a stool sample, giving our testing facilities over 5GB of extensive microbiome data. An algorithm uses that data to create a digitized clone of the microbiome, test thousands of bacterial strains against it, and find ones that will colonize and be of benefit. These strains are then compiled into a supply of probiotics. Every 3 months, we test again to see how the microbiome has changed, and use the results to improve the next formula. The longitudinal gut data collected will be used in the future to be able to identify chronic diseases such as Alzheimer’s and dementia, years before they begin to affect the individual. Sign up here: https://gutgutgoose.com (link in bio) 💚🪿

    Today we officially launch! GutGutGoose makes personalized probiotics that engineer the human microbiome. Personalization is the future of healthcare, yet the entire probiotics industry is still operating under a one-size-fits-all premise. The formulations are made without...

  7. Instagram

    ❌ Stop buying your probiotic from the grocery store.⁣ ⁣ Does this sound like you:⁣ I eat well. ⁣ I do all the things.⁣ I’m still bloated.⁣ I’m still irregular.⁣ ⁣ Most people think that taking the probiotic from their local store is sufficient or even good for them.⁣ ⁣ But what they don’t understand is that this could be making your gut issues worse.⁣ ⁣ Gut health needs to be taken way more seriously than “grab whatever’s on the shelf. Your gut microbiome is specific and unique to you… environmentally, biologically, hormonally, and even emotionally. ⁣ ⁣ That’s why most people don’t understand that supporting their gut is NOT A ONE SIZE FITS ALL.⁣ ⁣ @gutgutgoose is changing this narrative. Check them out and go take the free gut test (link in bio) and come finally support what your gut is actually trying to tell you.⁣ ⁣ 👉🏼Then join me LIVE Monday, August 10 at 8pm EST / 5pm PST, I’m breaking it all down.⁣

    ❌ Stop buying your probiotic from the grocery store.⁣ ⁣ Does this sound like you:⁣ I eat well. ⁣ I do all the things.⁣ I’m still bloated.⁣ I’m still irregular.⁣ ⁣ Most people think that taking the probiotic from their local store is sufficient or even good for them.⁣ ⁣ But what...

  8. Instagram

    🤯 How is NO ONE talking about this?⁣ ⁣ Does this sound like you? ⁣ ⁣ 👉🏼You eat clean, take your supplements, drink your water... and still feel bloated, foggy, and exhausted by 2pm?⁣ ⁣ I see this constantly in my practice. Women doing everything “right” and still getting told it’s stress, or hormones, or they just need more fiber.⁣ ⁣ Here’s what nobody is connecting: your gut isn’t generic. It’s shaped by YOUR hormones, YOUR history, YOUR stress levels, and it shifts through your cycle, perimenopause, postpartum.⁣ ⁣ A probiotic that works for your friend isn’t guaranteed to work for you. That’s not a failure on your part. That’s biology.⁣ ⁣ @gutgutgoose is finally building something personalized to who you actually are, not the average person.⁣ ⁣ Want to find out what’s actually going on with YOUR gut? ⁣ ⁣ Here’s how:⁣ ✔️Follow @gutgutgoose⁣ ✔️Tag your friends in the comments to take the free Gut Assessment Test (link in bio)⁣ ⁣ 👉🏼The person who refers the most friends wins a FREE Gut Test and Advanced Gut Test Report, a $50 a month value!⁣ ⁣ ❤️ Tag a woman who’s tried everything and is still guessing.⁣

    🤯 How is NO ONE talking about this?⁣ ⁣ Does this sound like you? ⁣ ⁣ 👉🏼You eat clean, take your supplements, drink your water... and still feel bloated, foggy, and exhausted by 2pm?⁣ ⁣ I see this constantly in my practice. Women doing everything “right” and still getting...