A hand holds up a brown glass jar with a black lid labeled Gut Balance by SecondKind, featuring a minimalist design with white dots and text against a light gray background.

The Postbiotic Era
Is Here.

Fast-acting gut–brain support for clarity, calm, and balance.*

Postbiotics your body actually uses - not probiotics that don't survive digestion.
Shop Now
How It Works
A young woman with dark hair pulled back is smiling widely and laughing, showing her teeth. She is wearing a black top and the background is plain and light-colored.

Trust your gut.
It’s your second brain.

When it’s off, everything is off. SecondKind restores balance for whole-body health.

Your gut produces

91%

of your
serotonin

50%

of your
dopamine

74%

of your
immune system

The Postbiotics

Breakthrough Formulations

Gut Balance

with BiomeBalance™

Targeted Postbiotics that reduce bloat, rebalance digestion, and support your immune defenses.*

A brown jar labeled “Gut Balance” by SecondKind, described as a postbiotic supplement for debloating, immunity, and digestion, with two beige capsules placed in front of the jar.
Shop Now

Mood Balance

with BiomeBalance™

Targeted Postbiotics that support mood, relieve stress, and restore emotional clarity.*

A brown jar labeled Mood Balance by SecondKind, containing 60 postbiotic supplement capsules for mood, stress support, and clarity. Two beige capsules are placed in front of the jar.
Shop Now
  • Vegan
  • Clinically Tested Ingredients
  • Non-GMO
  • Clean Label
  • Third Party-Tested
  • Made in the U.S.A.
  • Gluten-Free

Your Second Brain Has
Something to Tell You

Discover why your gut is the hidden system shaping your mood, immunity, clarity, and energy - and why postbiotics are the key to feeling like yourself again.

What Are Postbiotics?

A Trillion Times Better

Postbiotics are the real outcome you wanted in the first place.

See the Science

Prebiotics

The fertilizer.
Fibers that feed bacteria, but rarely work if the right microbes aren't present.

Probiotics

The seed.
Live bacteria you try to add, but fragile, inconsistent, and often don’t survive digestion.

SecondKind Postbiotics

The harvest.
Trillions of beneficial compounds your body actually needs, ready to work, stable, fast, and effective.

See the Science

Our Patented Postbiotic Complex

Introducing BiomeBalance™

Still tired, foggy, or bloated - despite doing all the right things? Your gut is your second brain, and when it’s off, everything feels harder. BiomeBalance™ uses clinically studied postbiotics - not fragile bacteria - to help you feel clearer, calmer, and lighter from the inside out.

No waiting. No guessing. Just results you can feel.

Shop Now

Gut

Digestion, debloat, and balance.

White elliptical lines and dotted curves intersect symmetrically around a vertical dotted axis on a black background, with white dots marking points along the curves and axis, resembling an abstract orbital diagram.

Mood

Clarity, calm, focus.

A black background with symmetrical, white curved lines and dotted arcs intersecting at the center, resembling abstract orbits with circles placed along the curves.

Immunity

Strengthens defenses
where it matters.*

Abstract geometric diagram with two white ellipses, several solid and dotted lines radiating from the center, and small white circles at intersections, all on a black background.
Shop Now

Why SecondKind

You’ve tried probiotics.
Now try what actually works.

Grounded
in research

→ Made with clinically studied postbiotics,
backed by science.

→ Made with clinically studied postbiotics,
backed by science.

Feel it in days or weeks,
not months

→ Many notice a difference
within the first bottle.

→ Many notice a difference
within the first bottle.

No fillers,
no fluff

→ Clean formulas with only
targeted ingredients.

→ Clean formulas with only
targeted ingredients.

Backed by science. Proven in real life.

Gut Check

92%felt calmer in 2 weeks

89%reported less bloating

The Science

Two Brains.
One Truth.

SecondKind isn't another probiotic. It's a Postbiotic. It's what comes after. The ready-to-use, already active nutrients your body actually uses. Fast-acting, shelf-stable, and clinically studied, they support mood, immunity, and digestion in a way pre and probiotics can't.

See How It Works
See How It Works
Discover Our Story

Our Story

This
started with our
family

We tried everything - probiotics, powders, endless fixes, but nothing worked. Then we discovered postbiotics: science-backed compounds your body actually uses to feel clear, calm, and balanced again.

— Remy, Founder & CEO

Discover Our Story

Proven Results

Trusted Science

See The Science
A smiling man with a bald head and neatly trimmed beard, wearing a white medical coat and a gray patterned tie, in front of a neutral gray background.

Gut health isn’t a niche topic anymore - it’s whole-body health, rooted in neuroscience and immunology. In clinical research, postbiotics are emerging as a direct, bioavailable way to influence gut health and systemic balance.

— Dr. Zachary Schwartz, MD, Family Medicine

A woman with long, wavy black hair and a bright smile is wearing a sleeveless gray top. She is posing in front of a plain white background.

As a holistic nutritionist, I’ve seen countless gut supplements offer fake promises and deliver nothing…. ineffective results. SecondKind stands apart because it’s postbiotic-first - finally, a solution that aligns with what the science tells us the body truly needs.

— Dr. Nancy Lin, PhD, Holistic Nutritionist

Smiling older man with short gray hair and glasses, wearing a white shirt and a patterned tie, against a plain white background.

By centering its formulas around postbiotics, SecondKind is translating the latest gut-brain research into something accessible for consumers. It reflects a more modern, science-forward understanding of digestive health.

 — Dr. Stuart Weinberger, MD, Gastroenterologist

Two supplement jars labeled Mood Balance and Gut Balance by SecondKind, along with two beige capsules, are arranged on a clean, light-colored surface with a minimalist, modern background design.

Gut Balance
$49.99

Choose Your Plan

Gut-Mood Combo Trial Pack → Save 15%

Feel it from the first bottle guarantee – 60-day money-back guarantee

SecondKind Edit

Notes from the Inside

saffron supplements mood boodting supplement ingredient

Saffron, Postbiotics & Mood: What Actually Works?

Saffron supplements are popping up seemingly everywhere you look, when it comes to mood boosting supplements. They've been praised for boosting mood, easing stress, and even rivaling prescription antidepressants in...
Read more