Heirloom Cultures Done Right

“Every tradition has a first batch.”

Family heirlooms have to start somewhere - Start yours today!

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What’s Your Flavor?

Three glass jars filled with different sourdough starters on a wooden tray, against a white tile background.

Sourdough Cultures

A wooden bowl filled with white yogurt next to a wooden spoon on a table with a burlap cloth.

Mesophilic Cultures

Three glass jars of plain yogurt on a white tray with wooden spoons.

Thermophilic Cultures

Kombucha, Jun, & Vinegars

The Bacteria Blog

What Our Customers Are Saying

We got a mesophillic and a thermophillic culture, both activated well and are making great yogurt! We have been home brewing kombucha and making sourdough for years, but this was our first time using heirloom yogurt cultures. I love how much information is available on the website, you can tell they really want people to be successful with fermentation and not just buy more of their products.

—Daniel C.

I absolutely love getting cultures from positively probiotic! Besides the best yogurt ever, I've experienced The most amazing customer service and advice!

—Zoey F.

Positively Probiotic is my go-to for buying cultures of all kinds for many years now. As usual, I got a high-quality product. Quick shipping. My culture was VERY active within 5 days, just like the activation instructions indicated. Excited to taste how delicious the bread turns out!

—Linn G.

Easy Cultures & Fun Ferments

At Positively Probiotic, we make fermentation joyful, approachable, and delicious. Our small-batch cultures nourish your kitchen—and your gut—with powerful probiotics and old world tradition. Whether it's creamy yogurt, vibrant kefir, or veggie ferments, we're here to guide and cheer you on. From our fermentation corner to yours, we believe culture should be shared, celebrated, and savored.

Don’t Settle

Are you ready to fuel your gut health with probiotics by the billions? Optimal functioning and overall well-being are within your reach when you prioritize a healthy gut environment. Say goodbye to artificial imitations and embrace whole food probiotics for sustained health benefits. Choose natural probiotic sources to support a thriving microbial ecosystem within - your gut will thank you!

More Variety

We have curated an impressive array of probiotic cultures. Our dedication to discovering and providing exceptional cultures distinguishes us. If you are searching for a particular culture that we currently do not offer, please send us a message.